The invention discloses a flow guide type aluminum alloy radiating type sectional material die with a cover. The flow guide type aluminum alloy radiating type sectional material die is characterized by comprising main radiator runners and auxiliary radiator runners; a main radiator is composed of the main base plate runner and the wing plate runners; the wing plate runners are connected with the main base plate runner; the cross sections of the wing plate runners are perpendicular to the cross section of the main base plate runner; and the two or more wing plate runners are arranged. Inverted-hook runners are arranged on the edges of the sides, away from the main base plate runner, of the wing plate runners; the inverted-hook runners on the adjacent wing plate runners are opposite in phase position; the auxiliary radiator runners are located above the main radiator runners and are provided with the connecting plate runner and the connecting wing runner; the connecting plate runner and the main base plate runner are the same in width; the number of the connecting wing runners and the number of the wing plate runners are the same and are in one-to-one correspondence; and the sides, away from the connecting plate runner, of the connecting wing runners are provided with clamping groove protrusions matched with the inverted-hook runners, and inverted hooks of products are clamped with clamping grooves. Pressure needed in extrusion is small, high convection can be formed by radiators, and the radiating efficiency is improved.