The invention relates to the field of cooling devices, and discloses a radiator for a thyristor element and an electric locomotive rectifier. The radiator comprises a skeleton and a plurality of main cooling fins, wherein the skeleton comprises a base part and a plurality of support leg parts extending from a first side surface of the base part; each of the plurality of support leg parts comprises two end part support leg parts adjacent to two ends of the first side surface; a second side surface, opposite to the first side surface, of the base part is used for being in contact with the thyristor element; and the main cooling fins extend between two adjacent support leg parts along the direction departing from the base part from the skeleton. According to the radiator for the thyristor element disclosed by the invention, short heat transfer paths from the thyristor element to the cooling fins are achieved; relatively large area of the cooling fins is ensured; and the radiator is convenient to assemble and disassemble, simple in structure and low in manufacturing cost.