The basic process of die-casting for large and difficult die-casting molds, die-casting molds for electroplating products, and die-casting molds for density products is as follows: the liquid metal is first cast at low or high speed and filled into the cavity of the mold. The mold has a movable cavity surface. It is forged under pressure with the cooling process of the liquid metal, which not only eliminates the shrinkage 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.