Embodiments of the invention disclose a method for forging a non-ferrous metal special-shaped forging using a combined die. According to the shape and dimension ranges of a product to be processed, an outer die sleeve (with sufficient capacity) and an upper die set are first manufactured and are fixed to upper and lower worktops of a forging and pressing apparatus; a group of outer die bushings (in various dimensional levels) are then manufactured and cut into segments as required; inner dies are then manufactured respectively according to different products and the suitable outer die bushings and are cut into segments as required; upper punch dies are manufactured respectively according to different products; in product forging and pressing, product inner dies and their supporting outer die bushings are fitted respectively in the outer die sleeve, a non-ferrous metal blank is charged into the inner dies, and the upper punch dies are coupled to the upper die set to forge and press a product. The forging product can be changed just by changing the product inner dies and their supporting outer die bushings as well as the upper punch dies.