The invention discloses a wind turbine pitch bearing fault detection method. According to the wind turbine pitch bearing fault detection method, a vibration signal thereof can be acquired when a pitchbearing runs normally; through analysis of an shock signal, caused by exfoliation, scratches, metal scraps and the like, in the vibration signal, an early fault of the pitch bearing is detected, andan early warning is given, so that the bearing can be replaced as early as possible to avoid a serious accident.