Abstract：The fault diagnosis technology of coal mine machinery is the core technology to ensure the safety of coal mine production, and an indispensable part of the intelligent development of coal mines. In this paper, the fault diagnosis technology of coal mine machinery is divided into model-based fault diagnosis technology and data-driven fault diagnosis technology from the perspective of fault diagnosis principle, and the related research status is elaborated. Then，the fault diagnosis technology of coal mine machinery is classified from the perspective of signal types used in fault diagnosis, and the advantages and disadvantages of various types are analyzed.On this basis, the current difficulties in fault diagnosis of coal mine machinery and equipment are pointed out and corresponding countermeasures are proposed. The research in this paper can provide guidance for promoting the engineering application of coal mine machinery fault diagnosis technology.