Flotation device for sewage treatment

The utility model provides a flotation device for sewage treatment. The device comprises a flotation tank, a gas dissolving device and a slag scraping device, wherein a water inlet dosing area, a dissolved air water area, an air flotation area and a clear water area are sequentially arranged in the flotation tank; the slag scraping device is positioned at the upper part of the air floatation area;a first partition plate is arranged between the water inlet dosing area and the gas-dissolved water area; a first inlet is formed in the bottom of the first clapboard; a second partition plate is arranged between the dissolved air water area and the air flotation area, a second inlet is formed in the top of the second partition plate, a scum partition plate and a third inlet in the bottom of thescum partition plate are arranged between the air flotation area and the clear water area, a scum bin is connected to the top of the scum partition plate, a drainage pool is arranged on one side of the flotation pool, and a fo