In order to solve the problem of belt conveyor failure in coal mine, an intelligent decision support system is designed. Through the diagnosis and diagnosis of the characteristic parameters of belt conveyor, the fault diagnosis of conveyor deviation, slipping and tearing is completed, and the hidden problems are warned. The realization of the belt conveyor fault and the rapid maintenance of the hidden trouble can play a very good role in preventing the belt conveyor failure, improve the safety and economy of the coal mine production, and provide a theoretical reference for the design of the coal mine modernization intelligent mining system.