The traditional power monitor system has many shortcomings. For instance, the remote monitoring server needs to maintain the server regularly, the rent needs to be paid regularly, the server is difficult to develop, high cost is needed for operation maintenance and so on. We have designed a power load monitoring system based on OneNet platform. The remote monitoring of power parameters is realized by STM32 controlling ATT7022B electric power metering chip, ESP8266 WIFI transmission module and GPS positioning module with the OneNet open platform. The practical engineering application shows that the power monitor has stable operation and meets the power monitor voltage and current measurement accuracy within 0.5 specifications requirements.