Belt pulley for washing machine and washing machine

The invention provides a belt pulley for a washing machine. The belt pulley for the washing machine comprises a belt pulley body and is characterized in that the belt pulley body comprises an outer rim, a hub and reinforcing ribs used for connecting the outer rim and the hub, a belt groove is formed in the outer rim, a washing machine belt is located in the belt groove, a plurality of adjusting grooves are further formed in the belt groove, an adjusting ring used for adjusting belt installation allowance is movably installed in the adjusting grooves, a plurality of extension springs are installed between the adjusting ring and the groove face, first locking holes are formed in the outer rim, second locking holes are formed in the adjusting grooves, and adjusting rods penetrate through the first locking holes, the adjusting ring and the second locking holes to fix the position of the adjusting ring; a balance piece for keeping the belt pulley body balanced and stable is arranged on the reinforcing ribs and is