Since the traditional battery power supply mode cannot meet the energy consumption requirements of WSN (Wireless Sen-sor Network), a photovoltaic power generation system based on WSN node energy supplement is designed. According to the infor-mation of illumination intensity collected by four regions photoelectric sensors, STM32minimum system drives and controls thehorizontal and vertical steering gear, which makes solar panels obtain maximum illumination intensity in time. When the lithium bat-tery and capacitor hybrid energy storage scheme is adopted, the experimental results indicate that the charging current of0.1A can beprovided for the lithium battery under the test conditions. After continuous charging for half an hour, the voltage of the lithium bat-tery can be increased by8.47%, which can prolong the life of the wireless sensor node.