A heat sink clip (1) includes a main body (10), a post (40), a spring (50) and a cammed handle (30). The main body includes a horizontal portion (12) and two locking arms (16). A locking hole (17) is defined in an end of each locking arm for engaging with catches (82) of a socket (80). The post has a pressing block (44) at a bottom portion and a cutout (42) at a top portion. The spring is placed around the post and rests on the pressing block The post extends through a through aperture (13) of the horizontal portion, and the cutout pivotally receives a cam (32) at one end of the handle. When the handle is pressed, the horizontal portion of the main body is raised by the decompressed spring, so that the locking arms tightly engage with the catches of the socket.