diff --git a/src/common/data_models/message_manager_data_model.py b/src/common/data_models/message_manager_data_model.py
index 0a49b23a6..81e8a7764 100644
--- a/src/common/data_models/message_manager_data_model.py
+++ b/src/common/data_models/message_manager_data_model.py
@@ -55,6 +55,7 @@ class StreamContext(BaseDataModel):
     priority_info: dict | None = None
     triggering_user_id: str | None = None  # 触发当前聊天流的用户ID
     is_replying: bool = False  # 是否正在生成回复
+    processing_message_id: str | None = None  # 当前正在规划/处理的目标消息ID，用于防止重复回复
 
     def add_action_to_message(self, message_id: str, action: str):
         """
diff --git a/src/plugins/built_in/affinity_flow_chatter/planner.py b/src/plugins/built_in/affinity_flow_chatter/planner.py
index b9644fcf7..a24059c05 100644
--- a/src/plugins/built_in/affinity_flow_chatter/planner.py
+++ b/src/plugins/built_in/affinity_flow_chatter/planner.py
@@ -189,6 +189,37 @@ class ChatterActionPlanner:
                 plan_filter = ChatterPlanFilter(self.chat_id, available_actions)
                 filtered_plan = await plan_filter.filter(reply_not_available, initial_plan)
 
+            # 4.5 检查是否正在处理相同的目标消息，防止重复回复
+            target_message_id = None
+            for action in filtered_plan.decided_actions:
+                if action.action_type in ["reply", "proactive_reply"] and action.action_message:
+                    # 提取目标消息ID
+                    if hasattr(action.action_message, 'message_id'):
+                        target_message_id = action.action_message.message_id
+                    elif isinstance(action.action_message, dict):
+                        target_message_id = action.action_message.get('message_id')
+                    break
+            
+            # 如果找到目标消息ID，检查是否已经在处理中
+            if target_message_id and context:
+                if context.processing_message_id == target_message_id:
+                    logger.warning(
+                        f"目标消息 {target_message_id} 已经在处理中，跳过本次规划以防止重复回复"
+                    )
+                    # 返回 no_action，避免重复处理
+                    from src.common.data_models.info_data_model import ActionPlannerInfo
+                    no_action = ActionPlannerInfo(
+                        action_type="no_action",
+                        reasoning=f"目标消息 {target_message_id} 已经在处理中，跳过以防止重复回复",
+                        action_data={},
+                        action_message=None,
+                    )
+                    return [asdict(no_action)], None
+                else:
+                    # 记录当前正在处理的消息ID
+                    context.processing_message_id = target_message_id
+                    logger.debug(f"开始处理目标消息: {target_message_id}")
+
             # 5. 使用 PlanExecutor 执行 Plan
             execution_result = await self.executor.execute(filtered_plan)
 
@@ -209,12 +240,20 @@ class ChatterActionPlanner:
                     context.chat_mode = ChatMode.NORMAL
                     await self._sync_chat_mode_to_stream(context)
 
-            # 8. 返回结果
+            # 8. 清理处理标记
+            if context:
+                context.processing_message_id = None
+                logger.debug(f"已清理处理标记，完成规划流程")
+
+            # 9. 返回结果
             return self._build_return_result(filtered_plan)
 
         except Exception as e:
             logger.error(f"增强版规划流程出错: {e}")
             self.planner_stats["failed_plans"] += 1
+            # 清理处理标记
+            if context:
+                context.processing_message_id = None
             return [], None
 
     async def _normal_mode_flow(self, context: "StreamContext | None") -> tuple[list[dict[str, Any]], Any | None]:
@@ -258,6 +297,27 @@ class ChatterActionPlanner:
                     break
             
             if should_reply and target_message:
+                # 检查是否正在处理相同的目标消息，防止重复回复
+                target_message_id = target_message.message_id
+                if context and context.processing_message_id == target_message_id:
+                    logger.warning(
+                        f"Normal模式: 目标消息 {target_message_id} 已经在处理中，跳过本次规划以防止重复回复"
+                    )
+                    # 返回 no_action，避免重复处理
+                    from src.common.data_models.info_data_model import ActionPlannerInfo
+                    no_action = ActionPlannerInfo(
+                        action_type="no_action",
+                        reasoning=f"目标消息 {target_message_id} 已经在处理中，跳过以防止重复回复",
+                        action_data={},
+                        action_message=None,
+                    )
+                    return [asdict(no_action)], None
+                
+                # 记录当前正在处理的消息ID
+                if context:
+                    context.processing_message_id = target_message_id
+                    logger.debug(f"Normal模式: 开始处理目标消息: {target_message_id}")
+                
                 # 达到reply阈值，直接进入回复流程
                 from src.common.data_models.info_data_model import ActionPlannerInfo, Plan
                 from src.plugin_system.base.component_types import ChatType
@@ -287,6 +347,11 @@ class ChatterActionPlanner:
                 
                 logger.info("Normal模式: 执行reply动作完成")
                 
+                # 清理处理标记
+                if context:
+                    context.processing_message_id = None
+                    logger.debug(f"Normal模式: 已清理处理标记")
+                
                 # 无论是否回复，都进行退出normal模式的判定
                 await self._check_exit_normal_mode(context)
                 
@@ -310,6 +375,9 @@ class ChatterActionPlanner:
         except Exception as e:
             logger.error(f"Normal模式流程出错: {e}")
             self.planner_stats["failed_plans"] += 1
+            # 清理处理标记
+            if context:
+                context.processing_message_id = None
             return [], None
 
     async def _check_exit_normal_mode(self, context: "StreamContext | None") -> None: