The utility model discloses a radiator installation structure which comprises a radiator body, four through holes are formed in the radiator body, first annular grooves are formed in the four through holes, second annular grooves are formed in the inner walls of the upper portions of the first annular grooves, and installation blocks are arranged in the through holes. Four connecting plates are fixedly arranged on the outer wall of the mounting block, and an extension stop block is arranged on the upper portion of one end of each connecting plate. The radiator is provided with the radiator body, the through hole, the first annular groove, the second annular groove, the mounting block, the connecting plate, the extension check block and the fixing bolt, and can move within a certain range, so that the mounting position of the radiator body can be finely adjusted within a certain distance when the radiator body is mounted, the mounting universality of the radiator body is improved, and the service life of the radiator body is prolonged. The problem that due to the design problem, the installation preset hole of the radiator cannot be aligned with the installation preset position in the computer host, and installation cannot be achieved due to some size deviation is solved.