Abstract: Aiming at the shortcomings of the traditional coal mine explosion-proof frequency converter, the design scheme of the three-level mine combined explosion-proof frequency converter is put forward. The structure design of the main circuit and the control algorithm of the three-level inverter are discussed in detail. Matlab/Simulink simulates the proposed two-inverter combined three-level inverter. The simulation results show that the voltage waveform is close to the sine wave and the total harmonic distortion (THD) of the waveform is low. The proposed three-level combined modular explosion-proof inverter the advantages of a detailed analysis, through the test to verify the correctness of the design.