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The high-frequency pulse power supply plays an important role in improving the manufacturability of the micro electrochemical machining. The pulse width modulator generates the IGBT control signal through the drive circuit to determine the output frequency and duty cycle of the high-frequency and high-voltage pulse power source. In view of the particularity of the electrochemical machining, a innovational solution based on the 32-bit microcontroller chip STM32F103RCT6 as the core to regulate the frequency and the duty cycle, was proposed. According to the requirement of regulating the pulse frequency and duty cycle, it has already completed the hardware and software design of the pulse width modulator in the study. A series of regulating the frequency and the duty cycle experiments were performed by compiling and running the program code, and the PWM waveforms of the two outputs were collected by an oscilloscope. Experiments show that the self-developed pulse width modulator can stably regulate the frequency and duty cycle of the two PWM control signals, verifying the rationality of the device and design.