diff --git a/mihoyo_libs/get_data.py b/mihoyo_libs/get_data.py
index d263ac7d..ca859004 100644
--- a/mihoyo_libs/get_data.py
+++ b/mihoyo_libs/get_data.py
@@ -185,7 +185,14 @@ async def select_db(userid, mode='auto'):
 
 async def delete_cache():
     try:
-        copyfile('ID_DATA.db', 'ID_DATA_bak.db')
+        today = datetime.date.today()
+        endday = today - datetime.timedelta(days=5)
+        date_format = today.strftime("%Y_%d_%b")
+        endday_format = endday.strftime("%Y_%d_%b")
+        copyfile('ID_DATA.db', f'ID_DATA_BAK_{date_format}.db')
+        if os.path.exists(f'ID_DATA_BAK_{endday_format}.db'):
+            os.remove(f'ID_DATA_BAK_{endday_format}.db')
+            logger.info(f'————已删除数据库备份{endday_format}————')
         logger.info('————数据库成功备份————')
     except:
         logger.info('————数据库备份失败————')