In order to solve the problem that the parameters of traditional electric baton power supply cannot be adjusted, the circuit of 45 kV high voltage pulse power supply is designed by using PWM modulator SG3525A and single chip AT89C51. According to the overall structure and working principle of the power supply circuit, the SG3525A output PWM signal is used to control the turn-on and cut-off of the MOSFET tube. After high frequency transformer isolation boost and rectification filter, 45 kV high voltage pulse is obtained, and the SG3525A is turned on and off by AT89C51. The application results show that the power supply circuit can realize adjustable voltage frequency and duty cycle, and can provide 16 discharge duration modes.