With the increase of the types of electrical equipment and the increase of the power of special vehicles, the power supply reliability, intelligence and safety requirements of the on-board power supply and distribution system are getting higher and higher, and the traditional on-board power supply and distribution system can no longer meet the power demand of special vehicles. In order to improve the reliability, intelligence level and safety of the power supply and distribution system of the vehicle-mounted power supply and distribution system, an intelligent power supply and distribution system is designed, which can automatically identify the vehicle status and intelligently control the working state of the mains power supply, high-voltage lithium battery pack, generator set and high-voltage distribution box according to the use requirements, so as to realize the redundant power supply of various power sources. At the same time, the system can monitor the operation of various power supply and distribution equipment such as generator sets, high-voltage lithium battery packs, high-voltage distribution boxes, and rectifier power supplies online. It provides a reference for the design of power supply and distribution systems for special vehicles.