A new mobile device for inverter power is given by analyzing the requirements and the actual use conditions of the electric locomotives in the mine. In order to shorten developing period and reduce developing charge of high power electric equipment, simulation model of Three-Phase inverter power based IGBT on switching devices is built and simulation is carried for the inverting system which is used PWM technology in Simulink toolbox of MATLAB software, Parameters for each circuit component is selected according to the comparison and analysis of output voltage waves, the simulation model considered the main electro-circuit and the controller model separately which reflects the actual situation more accurately and provides reference for project design, it has also solved the problems in conventional logging, such as the big interference to be useful signals caused by generating electricity on surface and unsteadiness of electric current and the power under the mine.