The invention discloses a blade feathering method of a wind turbine generator. At least two feathering modes are selected according to the average wind velocity during halting feathering, and the variable pitch rates of the at least two feathering modes are different. When the average wind velocity during halting feathering is low, the corresponding variable pitch rate is higher than the variablepitch rate corresponding to the higher average wind velocity. Preferably, the two feathering modes are adopted, the variable pitch rate of the first feathering mode is higher than the variable pitch rate of the second feathering mode, and if the average wind velocity during halting feathering is smaller than a preset value, the first feathering mode is adopted; and if the average wind velocity during halting feathering is larger than or equal to the preset value, the second feathering mode is adopted for feathering. According to the blade feathering method, the different feathering modes are adopted according to the different wind velocities during halting, the large variable pitch rate is adopted when the wind velocity is lower, and the small variable pitch rate is adopted when the wind velocity is higher; and compared with an existing feathering mode, stable feathering and halting of the wind turbine generator can be guaranteed, the impact load during halting is effectively reduced,and the damage possibility of the wind turbine generator is reduced.