The basic process of die-casting for motor shell, extrusion and vacuum die-casting dies, and density product die-casting dies is as follows: the liquid metal is first cast at low or high speed to fill the mold cavity. The mold has a movable cavity surface, which is forged under pressure with the cooling process of the liquid metal, which not only eliminates the shrinkage cavity and porosity defects of the blank, but also enables the internal structure of the blank to reach the broken grain in the forging state. The comprehensive mechanical properties of the blank have been significantly improved.