A heat dissipation device includes one of heat sinks with different specifications each of which includes a core and supports extending outwards and radially from the core, and a fixing frame receiving the one of the heat sinks therein. The fixing frame comprises a side plate, a plurality of vertical walls extending downwardly from the side plate, and two sets of slots defined in an inner side of the side plate. Each of the slots extends upwardly from a bottom surface of the side plate to a certain depth to form a step at a top thereof. The slots are staggered with the vertical walls. The supports correspondingly slide in one set of slots and abut corresponding steps.