diff --git a/plugins/message_summary/main.py b/plugins/message_summary/main.py
index 913ebf4..e45d7e1 100644
--- a/plugins/message_summary/main.py
+++ b/plugins/message_summary/main.py
@@ -333,8 +333,10 @@ class MessageSummaryPlugin(MessagePluginInterface):
                     return True
                 else:
                     # 连文本内容都没有
-                    client_msg_id, create_time, new_msg_id = await self.bot.send_text_message(group_id,
-                                                                                              "❌ 生成总结失败，请稍后再试！")
+                    client_msg_id, create_time, new_msg_id = await self.bot.send_text_message(
+                        group_id,
+                        "❌ LLM总结失败：返回空内容，请稍后重试。",
+                    )
                     self.revoke.add_message_to_revoke(group_id, client_msg_id, create_time, new_msg_id, 5)
                     return False
 
@@ -1671,6 +1673,12 @@ class MessageSummaryPlugin(MessagePluginInterface):
                     raise RuntimeError(self.llm_client.last_error or "LLM 未返回有效总结内容")
 
                 answer = self._clean_summary_output(response.get("text", ""))
+                # 空内容保护：
+                # 1. 模型可能返回空白、仅分隔符或被清洗后为空；
+                # 2. 此时不继续走模板/Markdown 渲染，直接视为 LLM 失败并进入重试；
+                # 3. 重试耗尽后交由上层统一提示“LLM总结失败”，避免发送空消息骚扰群聊。
+                if not answer or not answer.strip():
+                    raise RuntimeError("LLM总结失败：返回空内容")
                 metadata = {"usage": response.get("usage", {}) or {}}
                 spath = ""
                 # 说明：
@@ -1716,7 +1724,8 @@ class MessageSummaryPlugin(MessagePluginInterface):
                 self.LOG.warning(f"群总结生成失败，准备重试: attempt={attempt}/{max_retries}, delay={delay}s")
                 await asyncio.sleep(delay)
 
-        return "生成总结时出错", None
+        # 重试耗尽后返回空字符串，外层会识别为空并给出明确失败提示，不再发送无意义文本内容。
+        return "", None
 
     @staticmethod
     def _prepend_stats_section(summary: str, message_stats: Dict[str, int]) -> str: