Motor rotor casting die

The utility model discloses a motor rotor casting die. The motor rotor casting die comprises an upper die, a middle die and a lower die. A cavity communicated with the two ends of the middle die is formed in the middle die, the center of the upper die and the center of the lower die are provided with a dummy shaft penetrating through the cavity, the annular surface of the upper end of the middle die is evenly provided with a plurality of air discharge grooves, one end of each air discharge groove is communicated with the wall of the cavity, the other end of each air discharge groove is communicated with the outer side face of the middle die, and a plurality of liquid inlet holes are evenly formed in the lower die. In the process of low-pressure casting, aluminum liquid is pressed and ejected into the cavity from the liquid inlet holes, and the air in the cavity is fast discharged from the air discharge grooves. Therefore, the motor rotor casting die has the advantages that shrinkage holes and air holes produc