Abstract: The paper introduced power supply solution and equipments of high cutting coal mining face of Shenhua Wuhai Coal Group Co., Ltd., studied feasibility of application of soft starter in scraper conveyor, and analyzed electrical shock to mobile substation produced by starting of load of mining area. Using Matlab/Simulink software to create a mining area power supply system model and analyze start performance of soft starter, adopting current-limiting start mode at light load and frequency conversion start mode at overload, the simulation results show that the soft starter can effectively reduce electrical shock of starting of electrical equipments.