The wind turbine is located in a bad environment, so the main components such as blades, gearbox, generator, converter and transmission system are prone to failure during the operation of the wind turbine, resulting in the shutdown of the unit. It seriously affects the operation efficiency and power generation of the equipment. This paper analyzes the common faults of the wind turbine generator. In order to diagnose and monitor the running state of the generator in time, so as to find and deal with the faults in time, this paper designs a fault diagnosis method for the wind turbine generator.