The basic technological process of automobile die casting die, extrusion die casting die and vacuum die casting die is: the liquid metal is first cast at low speed or high speed and filled into the cavity of the die. The die has a movable cavity surface. It is pressurized and forged with the cooling process of the liquid metal, which not only eliminates the shrinkage cavity and porosity defects of the blank, but also makes the internal structure of the blank reach the broken grain in the forged state. The comprehensive mechanical properties of the blank have been significantly improved.