The invention provides a heat radiation device and an electrical part. The heat radiation device comprises a body and a cooling pipe, wherein the cooling pipe is arranged in the body, two ends of thecooling pipe penetrate through the body and are communicated with an outer part of the body, and a positioning structure used for performing positioning matching with a heating electronic component isformed at a first side of the body. The heat radiation device is advantaged in that the positioning structure is arranged on the body, positioning matching with the heating electronic component can be effectively performed, accurate positioning of the heat radiation device and the heating electronic component is guaranteed, heat radiation efficiency is improved, moreover, heat absorption efficiency of the cooling medium is improved on the condition that extrusion for the heating electronic component can be avoided, the utilization rate of the cooling medium is improved, the heat radiation effect is improved, through setting heat radiation fins, under the condition of heat radiation of the cooling medium, air-cooled heat radiation is improved, and heat radiation performance of the heat radiation device is improved.