The invention discloses a cleaning device for waste plastics, which comprises a plurality of cleaning troughs arranged sequentially, wherein each cleaning trough is provided with a water input end and a water output end, the water outlet end of the latter cleaning trough corresponds to the water input end of the previous cleaning trough, a filter plate is arranged in each cleaning trough, the filter plate divides the cleaning trough into a dynamic water area above the filter plate and a static water area below the filter plate, a spiral push rod capable of moving impurities out of the cleaning trough is arranged in the static water area, the cleaning trough corresponding to one end of the spiral push rod is provided with an impurity discharge port, and the dynamic water area is provided with a plurality of stirring devices which are arranged in parallel and can drive the waste plastics to advance; and the position of each cleaning trough close to the water output end is provided with a partition plate, the bottom of the partition plate is higher than that of the cleaning trough, the partition plate partitions the dynamic water area and the water input end, and the static water area is communicated with the water output end through the partition plate. The cleaning device has simple structure, the water for cleaning can be recycled, and more resources are saved.