This invention is a tube-style radiator structure, which includes an air-cooled fins, two heat conduction tubes, a base and a cover. Each of the heat conduction tubes has two straight tube sections and an arc tube section so as to form the shape of "U". One of the straight tube sections of each heat conduction tube passes through the air-cooling fin part and the other straight tube thereof lies in one of two grooves provided in the base. Accordingly, a large cooling area can be obtained and the efficiency of heat dissipation can be enhanced effectively.