Die-casting die is a method of casting liquid die forging and a process completed on a special die-casting die forging machine. Its basic technological process is: firstly, molten metal is cast at low speed or high speed and filled into the cavity of the mold, and the mold has a movable cavity surface. It is forged under pressure with the cooling process of molten metal, which not only eliminates the shrinkage and porosity defects of the blank, but also makes the internal structure of the blank reach the forged broken grains. The comprehensive mechanical properties of the blank have been significantly improved.