Based on STM32F105VCT6 chip, this paper designs a control system for three-phase AC charging pile. Firstly, the main structure of the three-phase AC charging pile control system is proposed. Then the hardware circuit and software program of the control system are designed, including control guiding state detection circuit, three-phase voltage and current measurement circuit. The Keil μVision5 adopted in this paper is used to design control guidance circuits, state detection circuits and other software programs. The final prototype test shows that the three-phase ac charging pile control system designed in this paper can realize the correct response between the charging pile and the vehicle, and can be used in the charging field of electric vehicles.