Pretreatment air flotation device

The utility model discloses a pretreatment air flotation device, which relates to the technical field of water treatment equipment and comprises an air flotation box, a water inlet of the air flotation box is connected with a water outlet of a filter box through a pipeline, an inclined filter screen is arranged on one side, far away from the air flotation box, of the filter box, and an overflow groove is formed in the upper part of the filter screen. A water inlet pipe is arranged above the overflow groove; a waste residue collecting groove is formed in the bottom of the filter screen; whereina plurality of precipitation inclined plates are arranged in the filter box at intervals, a coagulant inlet pipe is arranged on the side wall of the filter box, a booster pump is arranged on the coagulant inlet pipe, and the bottom of the filter box is conical and is provided with a blow-off pipe. Compared with the prior art, the sewage treatment device has the advantages that sewage in water isfiltered and precipitated