Wind turbine generator sets are all installed in the wild in areas with sandstorms or high humidity. The working conditions of wind power bearings are extremely harsh, and they need to withstand a wide range of temperature, humidity and load changes. In particular, yaw and pitch bearings need to bear relatively large axial forces and overturning moments, and gearbox bearings need to withstand huge impact loads during startup and braking. At the same time, the gearbox bearings of wind turbines are also required to have the characteristics of low friction torque and high running flexibility during low-speed startup. The bearings of wind turbine generator sets are generally divided into the following types: yaw bearings, pitch bearings, main shaft bearings, gearbox bearings and generator bearings. According to different bearing types, the technical requirements also vary.