diff --git a/app/api/daily_diff.py b/app/api/daily_diff.py
new file mode 100644
index 0000000..3a4bc25
--- /dev/null
+++ b/app/api/daily_diff.py
@@ -0,0 +1,94 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from ..core.database import get_db
+from ..core.response_code import ResponseCode
+from ..schemas.daily_diff import (
+    BatchCreateRequest,
+    BatchCreateResponse,
+    DailyDiffQueryRequest,
+    DailyDiffListResponse,
+    DailyDiffResponse,
+    BatchDeleteRequest,
+    BatchDeleteResponse
+)
+from ..services.daily_diff import DailyDiffService
+
+router = APIRouter(prefix="/daily_diff", tags=["每日差异数据"])
+
+@router.post("/batch_create", response_model=BatchCreateResponse)
+def batch_create(request: BatchCreateRequest, db: Session = Depends(get_db)):
+    """
+    批量新增数据
+    使用check_time和linecode检查重复，重复则跳过该条数据
+    """
+    try:
+        service = DailyDiffService()
+        # 转换为字典列表
+        data_list = [item.model_dump() for item in request.data]
+        result = service.batch_create(db, data_list)
+        
+        return BatchCreateResponse(
+            code=ResponseCode.SUCCESS if result['success'] else ResponseCode.IMPORT_FAILED,
+            message=result['message'],
+            total_count=result['total_count'],
+            success_count=result['success_count'],
+            skip_count=result['skip_count']
+        )
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"批量新增失败: {str(e)}"
+        )
+
+@router.post("/query", response_model=DailyDiffListResponse)
+def query(request: DailyDiffQueryRequest, db: Session = Depends(get_db)):
+    """
+    多条件查询
+    支持account_id、account_name、check_time、check_time范围、linecode等条件
+    """
+    try:
+        service = DailyDiffService()
+        data, total = service.query_by_conditions(
+            db,
+            account_id=request.account_id,
+            account_name=request.account_name,
+            check_time=request.check_time,
+            check_time_start=request.check_time_start,
+            check_time_end=request.check_time_end,
+            linecode=request.linecode,
+            linecodes=request.linecodes,
+            page=request.page,
+            page_size=request.page_size
+        )
+        
+        return DailyDiffListResponse(
+            code=ResponseCode.SUCCESS,
+            message="查询成功",
+            total=total,
+            data=[DailyDiffResponse.model_validate(item) for item in data]
+        )
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"查询失败: {str(e)}"
+        )
+
+@router.post("/batch_delete", response_model=BatchDeleteResponse)
+def batch_delete(request: BatchDeleteRequest, db: Session = Depends(get_db)):
+    """
+    批量删除数据
+    """
+    try:
+        service = DailyDiffService()
+        deleted_count = service.batch_delete(db, request.ids)
+        
+        return BatchDeleteResponse(
+            code=ResponseCode.SUCCESS,
+            message="删除成功",
+            deleted_count=deleted_count
+        )
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"删除失败: {str(e)}"
+        )
diff --git a/app/main.py b/app/main.py
index 2fe1c27..0cac66f 100644
--- a/app/main.py
+++ b/app/main.py
@@ -17,6 +17,7 @@ from .api.section_data import router as section_data_router
 from .api.level_data import router as level_data_router
 from .api.checkpoint import router as checkpoint_router
 from .api.function_list import router as function_list_router
+from .api.daily_diff import router as daily_diff_router
 from .utils.scheduler import task_scheduler
 
 # 初始化日志系统
@@ -100,6 +101,7 @@ app.include_router(section_data_router, prefix="/api")
 app.include_router(level_data_router, prefix="/api")
 app.include_router(checkpoint_router, prefix="/api")
 app.include_router(function_list_router, prefix="/api")
+app.include_router(daily_diff_router, prefix="/api")
 # app.include_router(test_router, prefix="/api")
 
 # 根路径
diff --git a/app/models/daily_diff.py b/app/models/daily_diff.py
new file mode 100644
index 0000000..7d58e02
--- /dev/null
+++ b/app/models/daily_diff.py
@@ -0,0 +1,21 @@
+from sqlalchemy import Column, BigInteger, String, Date
+from ..core.database import Base
+
+class DailyDiff(Base):
+    __tablename__ = "daily_diff"
+
+    id = Column(BigInteger, primary_key=True, index=True, autoincrement=True)
+    account_id = Column(BigInteger, nullable=False, comment="账号ID", index=True)
+    account_name = Column(String(100), comment="账号名称")
+    check_time = Column(Date, comment="检查时间", index=True)
+    linecode = Column(String(100), comment="线路编码", index=True)
+
+    def to_dict(self):
+        """将模型实例转换为字典"""
+        return {
+            "id": self.id,
+            "account_id": self.account_id,
+            "account_name": self.account_name,
+            "check_time": self.check_time.strftime("%Y-%m-%d") if self.check_time else None,
+            "linecode": self.linecode
+        }
diff --git a/app/schemas/daily_diff.py b/app/schemas/daily_diff.py
new file mode 100644
index 0000000..fa4a4ca
--- /dev/null
+++ b/app/schemas/daily_diff.py
@@ -0,0 +1,62 @@
+from pydantic import BaseModel, Field
+from typing import Optional, List
+from datetime import date
+
+class DailyDiffBase(BaseModel):
+    """daily_diff基础模型"""
+    account_id: int = Field(..., description="账号ID")
+    account_name: Optional[str] = Field(None, description="账号名称")
+    check_time: Optional[date] = Field(None, description="检查时间(年月日)")
+    linecode: Optional[str] = Field(None, description="线路编码")
+
+class DailyDiffCreate(DailyDiffBase):
+    """创建daily_diff请求模型"""
+    pass
+
+class DailyDiffResponse(DailyDiffBase):
+    """daily_diff响应模型"""
+    id: int
+
+    class Config:
+        from_attributes = True
+
+class BatchCreateRequest(BaseModel):
+    """批量新增请求"""
+    data: List[DailyDiffCreate] = Field(..., description="批量新增数据列表")
+
+class BatchCreateResponse(BaseModel):
+    """批量新增响应"""
+    code: int = 0
+    message: str
+    total_count: int = Field(0, description="总数据量")
+    success_count: int = Field(0, description="成功插入数量")
+    skip_count: int = Field(0, description="跳过重复数量")
+
+class DailyDiffQueryRequest(BaseModel):
+    """多条件查询请求"""
+    account_id: Optional[int] = Field(None, description="账号ID")
+    account_name: Optional[str] = Field(None, description="账号名称(模糊匹配)")
+    check_time: Optional[date] = Field(None, description="检查时间")
+    check_time_start: Optional[date] = Field(None, description="检查时间开始")
+    check_time_end: Optional[date] = Field(None, description="检查时间结束")
+    linecode: Optional[str] = Field(None, description="线路编码")
+    linecodes: Optional[List[str]] = Field(None, description="线路编码列表")
+    page: int = Field(1, ge=1, description="页码")
+    page_size: int = Field(20, ge=1, le=1000, description="每页数量")
+
+class DailyDiffListResponse(BaseModel):
+    """查询列表响应"""
+    code: int = 0
+    message: str
+    total: int = 0
+    data: List[DailyDiffResponse] = []
+
+class BatchDeleteRequest(BaseModel):
+    """批量删除请求"""
+    ids: List[int] = Field(..., description="要删除的ID列表")
+
+class BatchDeleteResponse(BaseModel):
+    """批量删除响应"""
+    code: int = 0
+    message: str
+    deleted_count: int = 0
diff --git a/app/services/daily_diff.py b/app/services/daily_diff.py
new file mode 100644
index 0000000..d4eb8b3
--- /dev/null
+++ b/app/services/daily_diff.py
@@ -0,0 +1,174 @@
+from sqlalchemy.orm import Session
+from sqlalchemy import and_
+from typing import List, Optional, Dict, Any, Tuple
+from datetime import date
+from ..models.daily_diff import DailyDiff
+from .base import BaseService
+import logging
+
+logger = logging.getLogger(__name__)
+
+class DailyDiffService(BaseService[DailyDiff]):
+    def __init__(self):
+        super().__init__(DailyDiff)
+
+    def batch_create(self, db: Session, data_list: List[Dict[str, Any]]) -> Dict[str, Any]:
+        """
+        批量新增数据
+        使用check_time和linecode检查重复，重复则跳过
+        优化：批量IN查询后代码处理，减少循环调用数据库
+        """
+        total_count = len(data_list)
+        if total_count == 0:
+            return {
+                'success': True,
+                'message': '数据为空',
+                'total_count': 0,
+                'success_count': 0,
+                'skip_count': 0
+            }
+
+        try:
+            # 提取所有check_time和linecode用于批量查询
+            check_times = list(set(item.get('check_time') for item in data_list if item.get('check_time')))
+            linecodes = list(set(item.get('linecode') for item in data_list if item.get('linecode')))
+
+            # 批量查询已存在的数据（IN查询）
+            existing_records = []
+            if check_times and linecodes:
+                existing_records = db.query(DailyDiff).filter(
+                    and_(
+                        DailyDiff.check_time.in_(check_times),
+                        DailyDiff.linecode.in_(linecodes)
+                    )
+                ).all()
+
+            # 构建已存在数据的key集合: (check_time, linecode)
+            existing_keys = set()
+            for record in existing_records:
+                key = (record.check_time, record.linecode)
+                existing_keys.add(key)
+
+            # 筛选需要插入的数据
+            to_insert = []
+            skip_count = 0
+            for item in data_list:
+                check_time = item.get('check_time')
+                linecode = item.get('linecode')
+                key = (check_time, linecode)
+                
+                if key in existing_keys:
+                    skip_count += 1
+                    logger.debug(f"跳过重复数据: check_time={check_time}, linecode={linecode}")
+                else:
+                    to_insert.append(item)
+                    # 添加到已存在集合，防止本批次内重复
+                    existing_keys.add(key)
+
+            # 批量插入
+            success_count = 0
+            if to_insert:
+                batch_size = 500
+                for i in range(0, len(to_insert), batch_size):
+                    batch = to_insert[i:i + batch_size]
+                    db_objects = [
+                        DailyDiff(
+                            account_id=item.get('account_id'),
+                            account_name=item.get('account_name'),
+                            check_time=item.get('check_time'),
+                            linecode=item.get('linecode')
+                        )
+                        for item in batch
+                    ]
+                    db.add_all(db_objects)
+                    success_count += len(batch)
+
+                db.commit()
+                logger.info(f"批量插入完成: 成功{success_count}条, 跳过{skip_count}条")
+
+            return {
+                'success': True,
+                'message': '批量新增完成',
+                'total_count': total_count,
+                'success_count': success_count,
+                'skip_count': skip_count
+            }
+
+        except Exception as e:
+            db.rollback()
+            logger.error(f"批量新增失败: {str(e)}", exc_info=True)
+            return {
+                'success': False,
+                'message': f'批量新增失败: {str(e)}',
+                'total_count': total_count,
+                'success_count': 0,
+                'skip_count': 0
+            }
+
+    def query_by_conditions(
+        self, 
+        db: Session,
+        account_id: Optional[int] = None,
+        account_name: Optional[str] = None,
+        check_time: Optional[date] = None,
+        check_time_start: Optional[date] = None,
+        check_time_end: Optional[date] = None,
+        linecode: Optional[str] = None,
+        linecodes: Optional[List[str]] = None,
+        page: int = 1,
+        page_size: int = 20
+    ) -> Tuple[List[DailyDiff], int]:
+        """
+        多条件查询
+        返回: (数据列表, 总数)
+        """
+        query = db.query(DailyDiff)
+
+        # 构建查询条件
+        if account_id is not None:
+            query = query.filter(DailyDiff.account_id == account_id)
+        
+        if account_name:
+            query = query.filter(DailyDiff.account_name.like(f"%{account_name}%"))
+        
+        if check_time:
+            query = query.filter(DailyDiff.check_time == check_time)
+        
+        if check_time_start:
+            query = query.filter(DailyDiff.check_time >= check_time_start)
+        
+        if check_time_end:
+            query = query.filter(DailyDiff.check_time <= check_time_end)
+        
+        if linecode:
+            query = query.filter(DailyDiff.linecode == linecode)
+        
+        if linecodes:
+            query = query.filter(DailyDiff.linecode.in_(linecodes))
+
+        # 获取总数
+        total = query.count()
+
+        # 分页
+        offset = (page - 1) * page_size
+        data = query.order_by(DailyDiff.id.desc()).offset(offset).limit(page_size).all()
+
+        return data, total
+
+    def batch_delete(self, db: Session, ids: List[int]) -> int:
+        """
+        批量删除
+        返回删除的记录数
+        """
+        if not ids:
+            return 0
+
+        try:
+            deleted_count = db.query(DailyDiff).filter(DailyDiff.id.in_(ids)).delete(synchronize_session=False)
+            db.commit()
+            logger.info(f"批量删除完成: 删除{deleted_count}条")
+            return deleted_count
+        except Exception as e:
+            db.rollback()
+            logger.error(f"批量删除失败: {str(e)}", exc_info=True)
+            raise e