The invention discloses a screw production process for a screw assembly of an injection molding machine, comprising the following steps: S1, ingredients: molybdenum carbide: 15-30 parts, tungsten carbide: 10-30 parts, chromium carbide Cr: 3 ~17 parts, nickel Ni: 5~20 parts, manganese Mn: 2~10 parts, iron Fe: 40~60 parts, copper Cu: 0.1~0.7 parts, iron boride FeB: 5~20 parts, silicon Si: 0.2 ~0.4 parts, modified phenolic resin adhesive 2~10 parts, aluminum: 5~20 parts; S2, mold making: according to the length of the alloy screw to be produced, it is necessary to select a pipe with a corresponding length to make a mold. In the present invention, the screw made of molybdenum carbide in the ingredients is more wear-resistant and corrosion-resistant, and has a longer service life. During the normalizing treatment, the normalizing treatment is adopted 2 to 3 times, so that the grains in the screw are refined and Uniform carbide distribution and increase hardness, improve processing performance, remove internal stress of materials, prevent deformation and cracking, thereby increasing the service life of the screw.