A separation device is described. The separation device includes a rack, a turntable rotatably disposed on the rack; and at least one magnetic element disposed on the turntable. The turntable includes a top surface, and the magnetic element is recessed in or flush with the top surface. The separation device includes a separation membrane detachably disposed on the top surface. In some cases, the at least one magnetic element comprises a plurality of magnetic elements, and the plurality of magnetic elements are spaced apart along a circumferential direction of the turntable. The separation device and a material separation method disclosed are capable of reducing impurities in a slurry.