Abstract: An assembly/disassembly pliers including two pivoted pliers bodies is used to assemble or disassemble a heat sink on or from a chip. The heat sink is disposed in a fixing member, and two hooks of the fixing member are buckled with the chip. An actuating handle and an operating board are respectively disposed on each pliers body, and a bump is extended from at least one operating board. The two actuating handles are actuated to drive the two operating boards to open towards opposite directions, such that the bumps push the fixing member and release the hooks, such that the fixing member and the heat sink are installed on or separated from the chip.