Abstract: The paper introduced functions, composition, working principle of frequency conversion control system of mine-used endless rope winch and its application in Huating Coal Mine.The system has functions of control, protection, display, voice prompt and emergency operation, and has been successfully used in 160 kW endless rope winch with double ropes in Huating Coal Mine to relocate 38 t hydraulic supports in a working face, which greatly reduces relocation time and improves work efficiency.