The invention provides a preparation method of a short-arc spherical crown shaped charge cover. The preparation method of the short-arc spherical crown shaped charge cover comprises the steps of spin-riveting for forming, carrying out recrystallizing heat treatment, and freeze cutting, wherein the spin-riveting for forming is characterized by point contact high pressure extrusion forming through spinning and riveting; the freeze cutting is used for cooling by adopting liquid nitrogen; and the liquid nitrogen flow is 250g to 500g/min. According to the preparation method of the short-arc spherical crown shaped charge cover provided by the invention, the shaped charge cover with a uniform and fine annealing recrystallization texture structure is obtained; and the cutting temperature and the wearing capacity of the cutter are reduced, so that the easiness in breaking through cutting is realized, not only is the dimensional accuracy ensured, but also the surface brightening is realized, andmeanwhile, the production efficiency of the product is further improved.