The present disclosure provides a water floating object treatment device for sewage treatment, including water pump, motor, round box, butt joint hole, liquid inlet pipe, electric adjusting valve, pneumatic controller, round frame, slurry pump, round tube, three-blade long plate, fan-shaped scraping plate, fine screw rod, guide sliding rod, wire brush bristle, assembling hole, fine-hole filter plate, strip hole, round plate, air cylinder, rubber round block, fan-shaped hole, threaded hole, and sliding hole. The present disclosure is reasonable in design, and function of filtering water in a treatment tank is realized. By replacing and installing the fine-hole filter plates with different sizes of holes, different degrees of filter effects are achieved. Meanwhile, the filtered water can be injected into corresponding treatment tank.