A heat dissipation device (100) includes a heat sink (10) having a plurality of fins (14) and a plurality of mounting brackets (20) buckled with the fins of the heat sink. Each of the mounting brackets includes a mounting plate (22) mounted on a top of the heat sink and a baffle plate (26) extending from one side of the mounting plate to a bottom of the heat sink. The baffle plate terminates with a retaining plate (28). A plurality of fasteners (50) extends through the retaining plates to mount the heat dissipation device onto a printed circuit board. Self-tapping screws (40) are used to extend through the fan and the mounting plates of the mounting brackets and threadedly engage with the fins thereby mounting the fan on the heat sink.