The invention discloses a waste plastic cleaning and sorting 
system. The waste plastic cleaning and sorting 
system comprises a first shredding 
machine, a pre-washing 
machine, a three-group sorting device, a 
crusher, a centrifugal 
machine and a 
cyclone separation device; the first shredding machine is used for shredding waste plastic; an input end of the pre-washing machine is connected with the first shredding machine and is used for receiving the shredded waste plastic; the three-group sorting device comprise a feeding screw, a 
mixing tank, a stirrer, a precipitator, a heavy 
slag filling machine, a first 
slag extracting machine and a light material filling machine; an input end of the 
crusher is connected with an output end of the light material filling machine; an input end of the centrifugal machine is connected with an output end of the 
crusher; the 
cyclone separation device comprises a mixing water tank, a swirler, a 
sedimentation tank, a second 
slag extractor and a friction cleaning machine; an input end of the mixing water tank is connected with an output end of the centrifugal machine; an output end of the swirler is respectively connected with the mixing water tank, the 
sedimentation tank and the second slag extractor; the 
precipitation tank is connected with the friction cleaning machine; and the friction cleaning machine is used for cleaning and outputting PP / PE (
polyethylene) plastic. According to the waste plastic cleaning and sorting 
system, the automatic 
recovery is achieved, the plastic 
recovery rate is improved, and the operation is stable.