The invention discloses a composite door. The composite door comprises a door frame and two opposite door sheets, wherein the door sheets are hinged on the door frame, each door sheet comprises a frame, a skin and a fixing part, the door sheets are of a double-layer skin structure, the skins are arranged in areas formed by the frames, the fixing parts are located at the outer sides of the skins, the fixing parts and the frames are made from stainless steel, the skins are aluminum plates, the fixing parts are welded to the frames, the skins are connected with the fixing parts through bolts, andthe double-layer skins are clamped between the fixing parts at the two sides; the centers of the skins of the sides, facing outward, of the door sheets are provided with first decorative parts. The skins of the door sheets are aluminum plates, the weight is low, carvings are made from aluminum, molding is achieved through casting, the texture is fine, and processing is easy; the fixing parts arearranged at the two sides to clamp the skins in the middle, and the skins and the fixing parts are fixed through bolts, so that the skins, the frames and the fixing parts are fixed integrally, the overall stability is good, and the problem that stainless steel cannot be welded with the aluminum material is solved.