A satellite power supply and distribution test system based on LAN bus, including remote measurement and control computer, measurement control system, ground power supply, ground adapter, ground power distributor, +Y solar battery array simulator, -Y solar battery array simulator, LAN bus converters, electronic loads and oscilloscopes. The present invention uses the solar array simulator to simulate the output characteristics of satellite solar cells, and realizes the test control function and simulation of satellite power supply and distribution signals through ground distributors, ground adapters and satellite equivalents. The test equipment is connected together through the LAN bus, the test layout is flexible, and the test system can be remotely controlled without being affected by the test environment. The system structure is simple and the development cycle is short.