Abstract: A heatsink clamper includes a buckle piece and a main body. The buckle piece includes a latch member buckled to a side of a seat that mounts the heatsink and the hot element of an electronic device, and a press member one end pivoted on an end of the latch member and another end includes a latch end correspondent to the latch portion of the latch member. The latch member includes a latch portion and a raised end. The main body includes a buckle latched to another side of the seat, and a pressing arm linked together included a hole correspondent to the raised end for passing through the raised end and moving relatively. When pressing the press member to move the latch end into the latch portion, the pressing arm is also pressed and deformed to provide a pressure to the heatsink through a receptacle groove.