Abstract: With the advancement of new energy grid connection,it is difficult to transmit the power quality monitoring terminal data from the new energy side to the main power quality monitoring station. For this reason,the communication protocol of power quality monitoring terminal for new energy side is designed based on smart IOT system. First,the technology framework of power quality data transmission on the new energy side based on the smart IOT system is presented. Then,the data encapsulation method of the power quality monitoring terminal on the new energy side is defined in detail based on the MQTT protocol framework. Finally,the feasibility of the proposed communication protocol is verified by the pilot application.