The utility model relates to a flat-shape rectification bridge, comprising a housing, a resin pouring layer, a commutation diode, a plurality of electrode pins; The electrode pins are protruded out of the resin pouring layer; the bridge body is provided with an installation through hole; the commutation diodes are all welded on the inner face of the aluminum base copper clad plate, and by a resin material, packaged in a cavity which is enclosed by the aluminum base copper clad plate. The aluminum base copper clad plate, with a high heat transfer property, can quickly pass the heat generated by the commutation diode at work to the radiator provided outside. The utility model is good in heat dispersion and simple in structure.