Abstract: Microwave has good penetration and absorption characteristics, which can be used in the medical field. As a typical microwave generator, magnetron can convert electrical energy into microwave energy, which is concentrated and applied to medical objects to produce corresponding physiotherapy effects. In order to solve the reliability problem in the process of microwave energy output, it is necessary to develop corresponding control devices to achieve the continuous and stable output of magnetron microwave energy. On the basis of mastering the working characteristics of magnetron devices, this paper designs a magnetron drive control system based on AC bidirectional chopper control. By sampling the working current of the magnetron anode in real time, after the deviation setting of the controller, proportional integral differentiation (PID) control is adopted to realize the continuous adjustable constant power output of the magnetron microwave in the current closedloop mode. As a small-scale physical auxiliary physiotherapy equipment, the developed device has been widely used in the market after continuous optimization and has achieved good application effects.