The invention relates to a wind generating set variable-pitch slip ring model selection method and device. The method comprises the following steps that a fan simulation model is established, and simulation is carried out according to the set operation condition of the fan to obtain the timing load of a fan variable-pitch system; the rated drive torque and the peak drive torque of variable-pitch motors are calculated according to the timing load of the fan variable-pitch system; equivalent rated power and equivalent peak power consumed by all the variable-pitch motors are calculated accordingto the rated drive torque, the peak drive torque and the equivalent rotating speed of the variable-pitch motors correspondingly; the equivalent rated current and the peak current of a variable-pitch slip ring are calculated according to the equivalent rated power and the equivalent peak power consumed by all the variable-pitch motors; and the variable-pitch slip ring is selected according to the equivalent rated current and the peak current of the variable-pitch slip ring. According to the method and the device, the model selection of the variable-pitch slip ring can be accurately achieved, the failure rate of the system is reduced, the service life of the variable-pitch slip ring is prolonged, and the safe and reliable operation of the variable-pitch system is guaranteed.