The invention relates to a high-powered energy-saving radiator. Each cooling fin A of aluminum alloy is provided with radiation fins which form closed tubes with special cross sections, both ends of each cooling fin A are provided with internal thread holes in the length direction, and a main water tube has a flat elliptical cross section with internal threads at both ends and is provided with penetrating screws for round holes at equal intervals for connecting the cooling fin A. One end of each penetrating screw is provided with an inner hexagon hole, the other end of each penetrating screw is provided with an inner hole and an external thread which is in threaded connection with the cooling fin A, and the middle section of each penetrating screw is transversally provided with a water hole. A water channel port of each cooling fin A is sealed by a plug, and one plug is provided with an inner through hole in which a heating rod is screwed to supply heat at a low temperature. A stainless cooling fin B is formed by sleeving and connecting a large steel tube and a small steel tube, a fixed plugging ring is welded at the end part, and a plane is punched on the conjunction between the large steel tube and the main water tube which are connected by a penetrating screw and a nut. The invention has the advantages of large cooling area, good cooling effect, energy saving, raw material saving, good sealing, disassembly and replacement capabilities and low cost.