The invention belongs to the technical field of automobile automatic control, and particularly relates to a gear selecting main core control CPU based on an AMT system. The gear selecting main core control CPU based on the AMT system is used for receiving and processing the information uploaded by a gear selecting control assembly, the data collected by an accelerator signal and the information uploaded by a mechanical throttle valve main core CPU or an electronic throttle valve main core CPU, and then a result is uploaded to the main core control CPU. In addition, the instruction of the main core control CPU is received, the corresponding instruction is sent to the gear selecting control assembly and the mechanical throttle valve main core CPU or the electronic throttle valve main core CPU, and corresponding operation is completed. In the process, the position monitoring information of the gear selecting control assembly and the mechanical throttle valve main core CPU or the electronic throttle valve main core CPU is further received, and the information is uploaded to the main core control CPU.