The invention provides a motor end cap fixed by positioning pins and a method. According to the scheme, the motor end cap, the positioning pins, a stator punch and positioning holes are used. The end cap has a supporting effect; a plurality of positioning holes are uniformly distributed in the end cap; the stator punch also has a supporting and fixing effect; positioning holes are also uniformly distributed in the stator punch; the number of the positioning holes of the stator punch is the same with that of the positioning holes of the end cap; and the positioning pins enter the positioning holes of the motor end cap and the positioning holes of the stator punch (3) in a punching manner. The motor end cap is simple in structure and convenient to operate; the motor end cap and the stator punch are machined into required structures; and the positioning pins are punched into the positioning holes of the motor end cap and the positioning holes of the stator punch by effects of an external power source, so that the motor end cap and the stator punch are fastened together in a punching manner. Materials are saved, the assembling efficiency of a motor is improved, the machining cost is reduced, the coaxility and the accuracy of the motor can be ensured after the motor is assembled, electromagnetic air gas of the motor are uniform, and noises are small.