Abstract: Vehicle on-board wireless communication devices provide the function of vehicle-ground wireless communication, passenger emergency intercom, and central-to-train broadcasting for metro fully automatic operation (FAO), and they are the key equipment for the safety operation of metro. The structure and functions of mobile radio are introduced, and the self-inspection process of the mobile radios is described according to the characteristics of FAO. By analyzing the actual scenarios in FAO lines, the self-inspection items of on-board wireless communication device of the train wake-up are summarized.