The invention discloses a treatment device for floating objects in sewage. The treatment device comprises a settling pool, a scraping plate is arranged inside the settling pool, the water surface elevation in the settling pool is between the height of the upper plate side and the height of the lower plate side of the scraping plate, the lower plate side of the scraping plate is arranged close to the water surface, and the power-driven scraping plate moves along the water surface to carry the floating objects on the water surface into a waste collection channel in a scrapping mode. Under the action of scraping moving of the scraping plate, the floating objects on the water surface can be scraped into the waste collection channel to be treated in a centralized mode. In this way, it can be effectively avoided that the floating objects in the sewage flow into the next treatment steps along with the sewage, and then the treatment difficulty and the treatment cost of the sewage are lowered. The treatment device is simple in structure, convenient to operate, good in using effect and capable of being applied and popularized in related enterprises of papermaking and others.