diff --git a/data_platform/daily_all_update.py b/data_platform/daily_all_update.py
index a9832a31..3646bfd8 100644
--- a/data_platform/daily_all_update.py
+++ b/data_platform/daily_all_update.py
@@ -142,8 +142,13 @@ def update_daily_parquet(code: str, new_data: pd.DataFrame) -> int:
     year = datetime.now().year
     parquet_path = DAILY_DIR / str(year) / f"{prefix}{clean}_daily.parquet"
 
+    # 确保date为字符串类型，避免和已有parquet的datetime.date冲突
+    new_data = new_data.copy()
+    new_data["date"] = new_data["date"].astype(str)
+
     if parquet_path.exists():
         existing = pd.read_parquet(parquet_path)
+        existing["date"] = existing["date"].astype(str)
         combined = pd.concat([existing, new_data], ignore_index=True)
         combined = combined.drop_duplicates(subset=["date"], keep="last")
         combined = combined.sort_values("date").reset_index(drop=True)