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The electric permanent magnet controller is designed based on STM32F103 as the core of control, and achieves the control of the process of magnetizing and demagnetizing under AC 380V input voltage. After the step-down treatment of synchronous transformer and the attainment of zero-crossing signal by zero-crossing detection circuit, the system outputs pulse train through the STM32F103 and adds to the SCR with pulse transformer KCB6743. In this way, the half-wave rectifier circuit power output is accurately implemented. With flexible and simple keystroke and the full display function, man-machine interaction is well realized. Through testing, it is found that the system can accurately achieve the process of magnetizing and demagnetizing on electric permanent magnet body and the adjustment of the magnetic force can also be achieved through the button Settings of filling demagnetization current. The features of low cost, easy operation, wide versatility and high reliability of the controller make it widely be used in electromagnetic field.