Abstract: In order to improve the stability of photovoltaic power generation equipment, combined with the Internet of Things technology, this paper designs a photovoltaic power generation monitoring system based on spread spectrum communication. The system uses various sensors to monitor the parameters of photovoltaic modules and the surrounding environment in real time, and after processing by a single-chip microcomputer, the data is transmitted to the ESP8266 through the LoRa network, and the data is uploaded to the cloud server platform by connecting to the local area network, and finally the data is delivered to the App. An experimental platform was built to test the system, and the test results showed that the system could monitor the working parameters in the process of photovoltaic power generation in real time and accurately, which was convenient for operation and maintenance personnel to understand the status of photovoltaic power generation in time and prevent failures.