The invention discloses a metal work piece shaping method. According to the metal work piece shaping method, the surface of a to-be-shaped metal work piece is subjected to at least two times of sand blasting treatment. By two times of sand blasting treatment, the metal work piece shaping method has the effects of effectively improving the planeness of the metal work piece, improving the surface flatness of the metal work piece, changing defective products into good products and reducing the rejection rate of the products; moreover, the metal work piece shaping method is easy to operate and high in efficiency.