Extrusion and vacuum die casting dies, aluminum/zinc/magnesium die casting dies, precision die casting dies, and the basic process of die casting are as follows: 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, 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.