Provided is a multi-functional rubbing and separating device, comprising a main body, a rotating axle and lapping blades; wherein a feeding port is disposed on one end of the main body and a discharge port is disposed on another end; the rotating axle and lapping blades are disposed inside said main body; the lapping blades are distributed on outer cylindrical surface of the rotating axle; and multiple through-holes are disposed on an sidewall of the main body. The multi-functional rubbing and separating device herein is added between a flotation tank and a washing tank, which can effectively improve the washing quality for waste plastics, thereby separating waste plastics and impurities more thoroughly and improving the quality of recycled products.