Abstract: In response to the characteristics of high power and energy consumption of the electromechanical equipment in coalbed methane wells, as well as the large impact, strong nonlinearity, and high power of the load in the power supply system, the power supply system is prone to high reactive power consumption and serious harmonic pollution, and the quality of power supply is not high. In order to effectively improve the power quality of the power supply system, based on the actual operating conditions of a coalbed methane well power supply system, the key technical parameters of the power quality control device for the coalbed methane well power supply system were determined. The hardware and software parts of the power quality control device were designed, and the system simulation and application testing were carried out. The results showed that before the application of the power quality control device, the power factor of the power supply system was low, and there was a large amount of reactive power. The grid side was prone to serious current. distortion phenomenon, After applying the power quality control device, due to the compensation of reactive power to the power supply system and the treatment of harmonic pollution, the grid side current no longer shows serious distortion. The power factor of the mine power supply system is greater than 0.95, and the power quality is significantly improved.