diff --git a/broker/config/wildfirechat.conf b/broker/config/wildfirechat.conf
index ea508281..23fa122b 100755
--- a/broker/config/wildfirechat.conf
+++ b/broker/config/wildfirechat.conf
@@ -123,6 +123,9 @@ chatroom.participant_idle_time 900000
 ## 用户向聊天室发送消息，自动加入聊天室
 chatroom.rejoin_when_active true
 
+## 当一个聊天室不存在时，如果有用户加入就自动创建
+chatroom.create_when_not_exist true
+
 ## 是否允许客户端发送操作群的自定义群通知消息
 group.allow_client_custom_operation_notification true
 
diff --git a/broker/src/main/java/io/moquette/BrokerConstants.java b/broker/src/main/java/io/moquette/BrokerConstants.java
index 94dff847..d02a7390 100755
--- a/broker/src/main/java/io/moquette/BrokerConstants.java
+++ b/broker/src/main/java/io/moquette/BrokerConstants.java
@@ -152,6 +152,8 @@ public final class BrokerConstants {
 
     public static final String CHATROOM_Participant_Idle_Time = "chatroom.participant_idle_time";
     public static final String CHATROOM_Rejoin_When_Active = "chatroom.rejoin_when_active";
+    public static final String CHATROOM_Create_When_Not_Exist = "chatroom.create_when_not_exist";
+
 
     public static final String GROUP_Allow_Client_Custom_Operation_Notification = "group.allow_client_custom_operation_notification";
     public static final String GROUP_Visible_Quit_Kickoff_Notification = "group.visible_quit_or_kickoff_notification";
diff --git a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
index a203c45b..86609e53 100755
--- a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
+++ b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
@@ -137,6 +137,7 @@ public class MemoryMessagesStore implements IMessagesStore {
 
     private long mChatroomParticipantIdleTime = 900000;
     private boolean mChatroomRejoinWhenActive = true;
+    private boolean mChatroomCreateWhenNotExist = true;
 
     private List<Integer> mForbiddenClientSendTypes = new ArrayList<>();
     private List<Integer> mBlackListExceptionTypes = new ArrayList<>();
@@ -245,6 +246,14 @@ public class MemoryMessagesStore implements IMessagesStore {
             printMissConfigLog(CHATROOM_Rejoin_When_Active, mChatroomRejoinWhenActive + "");
         }
 
+        try {
+            mChatroomCreateWhenNotExist = Boolean.parseBoolean(m_Server.getConfig().getProperty(BrokerConstants.CHATROOM_Create_When_Not_Exist));
+        } catch (Exception e) {
+            e.printStackTrace();
+            Utility.printExecption(LOG, e);
+            printMissConfigLog(CHATROOM_Create_When_Not_Exist, mChatroomCreateWhenNotExist + "");
+        }
+
         try {
             mChatroomParticipantIdleTime = Long.parseLong(m_Server.getConfig().getProperty(CHATROOM_Participant_Idle_Time, "900000"));
         } catch (Exception e) {
@@ -3061,7 +3070,12 @@ public class MemoryMessagesStore implements IMessagesStore {
     public ErrorCode handleJoinChatroom(String userId, String clientId, String chatroomId) {
         IMap<String, WFCMessage.ChatroomInfo> chatroomInfoMap = m_Server.getHazelcastInstance().getMap(CHATROOMS);
         if (chatroomInfoMap == null || chatroomInfoMap.get(chatroomId) == null) {
-            return ErrorCode.ERROR_CODE_NOT_EXIST;
+            if(mChatroomCreateWhenNotExist) {
+                WFCMessage.ChatroomInfo.Builder builder = WFCMessage.ChatroomInfo.newBuilder().setTitle(chatroomId);
+                createChatroom(chatroomId, builder.build());
+            } else {
+                return ErrorCode.ERROR_CODE_NOT_EXIST;
+            }
         }
 
         m_Server.getStore().sessionsStore().getSession(clientId).refreshLastChatroomActiveTime();
diff --git a/distribution/src/main/resources/wildfirechat.conf b/distribution/src/main/resources/wildfirechat.conf
index ce8c814c..d1d7a94d 100755
--- a/distribution/src/main/resources/wildfirechat.conf
+++ b/distribution/src/main/resources/wildfirechat.conf
@@ -117,6 +117,9 @@ chatroom.participant_idle_time 900000
 ## 用户向聊天室发送消息，自动加入聊天室
 chatroom.rejoin_when_active true
 
+## 当一个聊天室不存在时，如果有用户加入就自动创建
+chatroom.create_when_not_exist true
+
 ## 是否允许客户端发送操作群的自定义群通知消息
 group.allow_client_custom_operation_notification true