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For the resonant wireless charging system, due to disturbances such as load and coil coupling changes, if the current for charging the battery load is only subjected to open-loop control, it is prone to disturbance. Therefore, a classic PID controller is added to the forward channel to effectively implement the system in real time. Closed-loop control. Aiming at the problem that the parameters of the classic PID controller cannot be adaptively adjusted, a method of designing the parameters of the wireless charging PID controller using particle swarm optimization (PSO) self-tuning is proposed, and simulation analysis and experimental verification are carried out. The speed and stability of the later PID controller are better than the classic PID controller, the adjustment time is reduced by 0.647s, maximum overshoot decreased by 4.1% and the steady-state error error is reduced by 1.04%, which proves the feasibility and effectiveness of this method for improving the dynamic and static characteristics of the wireless charging system.