Building engineering dust falling device

The utility model discloses a constructional engineering dust falling device which comprises a dust collection shell used for installing all air suction parts. Through mutual cooperation of the dust collection shell, the partition plate, the dust removal bin, the air suction bin, the scraper blade mechanism, the air suction mechanism, the circulation mechanism, the ventilation hole and the dustproof net, a rotating motor is started, a scraper blade shaft rotates to drive a scraper blade to rotate, dust in air is further captured, water in the water storage bin is pressurized through the booster pump, and the dust in the air is effectively removed. Dust is fed into the spraying head through the water inlet pipe to be settled, meanwhile, settled dust is flushed, the dust attached to the inner wall of the dust removal bin is scraped through the scraping plate, the dust is prevented from being accumulated in the dust removal bin, the flushed dust and water enter the filtering bin through the flow guide bin, and t