diff --git a/boards/default_src/micropython/generators/iot.js b/boards/default_src/micropython/generators/iot.js
index 09bd2360..ddbaad29 100644
--- a/boards/default_src/micropython/generators/iot.js
+++ b/boards/default_src/micropython/generators/iot.js
@@ -173,10 +173,10 @@ export const IOT_EMQX_INIT_AND_CONNECT_BY_SHARE_CODE = function (_, generator) {
     // 根据server是否包含":"来生成不同的mqtt_client代码
     if (server.indexOf(':') !== -1) {
         // 包含":"，使用server.substring(1, server.indexOf(':'))
-        code += 'mqtt_client = mixiot.init_MQTT_client(' + server.substring(1, server.indexOf(':')) + ', sk[0], sk[2]' + ', MQTT_USR_PRJ)\n';
+        code += 'mqtt_client = mixiot.init_MQTT_client(' + server.substring(0, server.indexOf(':')) + server.substring(server.length - 1) + ', sk[0], sk[2]' + ', MQTT_USR_PRJ)\n';
     } else {
         // 不包含":"，使用完整的server（去掉首尾的引号）
-        code += 'mqtt_client = mixiot.init_MQTT_client(' + server.substring(1, server.length - 1) + ', sk[0], sk[2]' + ', MQTT_USR_PRJ)\n';
+        code += 'mqtt_client = mixiot.init_MQTT_client(' + server.substring(0, server.length - 1)+ server.substring(server.length - 1) + ', sk[0], sk[2]' + ', MQTT_USR_PRJ)\n';
     }
     return code;
 }