The invention belongs to the field of automobile automatic control technology and specifically relates to an AMT system's main control panel serial port communication detection method, including first serial port communication detection of a main control panel and second serial port communication detection of the main control panel. By the automobile AMT system's main control panel serial port communication detection method, the main control panel serial port communication function of an automobile AMT system can be detected, the possibility that the main control panel breaks down is minimized, and reliability of the main control panel is raised. Furthermore, possibility of the whole AMT system is higher, security of a car equipped with the AMT system is raised, and car accidents caused by failures of the AMT system are reduced.