The utility model discloses a casting wax injector. The casting wax injector comprises a worktable, a wax injection gun, a hoisting device, a rotating disc worktable and a cooling device. The casting wax injector having the structure is simple in structure and convenient to operate; meanwhile, the internal temperature of the rotating disc worktable is homogenized by use of the cooling device so that a casting can be cooled uniformly after going into the rotating disc worktable; besides, consistent cooling degree of wax patterns in a die and consistent size shrinkage of the size are guaranteed, and the size of the wax pattern is uniform.