The invention discloses a polyethylene plastic recovery processing device comprising a separator, a large particle cleaning device, a small particle cleaning device and a waste liquid processor. An upper material plate and a lower material plate are arranged in the separator. Slide rails are arranged on the side walls of the top end of the large particle cleaning device, a material collection plate is arranged on the slide rails, and a large particle cleaning device liquid discharge opening is formed in the bottom. A feed pipe is further connected to the external side wall of the large particle cleaning device. The bottom end of the lower material plate is connected with the small particle cleaning device through a guide pipe. The top end of the small particle cleaning device is provided with a motor and a liquid inlet, a motor rotating shaft and stirring blades are arranged in the small particle cleaning device, a small particle cleaning device liquid discharge opening and a dischargeport are formed in the bottom end, and the lower portion of the discharge port is further connected with a material storage box. The large particle cleaning device liquid discharge opening and the small particle cleaning device liquid discharge opening are connected with a waste liquid processor through a large particle cleaning device liquid discharge pipe and a small particle cleaning device liquid discharge pipe correspondingly. The device is simple in overall structure and convenient to use and has good application and popularization value.