The invention relates to a water pump pulley, which comprises a trapezoidal boss-shaped pulley body, wherein a shaft hole of an output shaft is arranged on the central boss of the pulley body; The pulley body is matched with the disc to form the pulley body; The pulley body is provided with a mounting hole; The disc is connected with the pulley body through bolts; A washer is arranged on the bolt between the disc and the pulley body; Notches are formed at the upper edges of the pulley body and the disc to form a belt groove.

The utility model has the advantages of simple structure and reasonable design. By increasing and decreasing the number of washers, the gap between the disc and pulley body is controlled, so as to control the groove width of the groove. Suitable for belts with different thicknesses, adjust the friction between belts and belt grooves to achieve perfect operation.