The invention relates to a device for quickly flowing airflow to eliminate dust. The device is characterized in that the device consists of an air inlet device, a dust suction system, an exhaust pipeand an arc-shaped water tank; on the one hand, when external air flows through the arc-shaped surface of the arc-shaped water tank, the flow speed is increased, the pressure is reduced, and the air inthe exhaust pipe is sucked to the upper part from the lower part and flows out from an exhaust port; on the other hand, the air introduced by the air inlet device flows into an underground air duct,and when the air passing through the anti-arc air eaves, the dust in a sand grinding workshop passes through a dust leakage floor and the anti-arc air eaves, enters the underground air duct, and passes through the water mist along with the air flow; wherein, a part of dust is covered by the water mist, so that when the dust falls downwards, the trace dust which is not covered by the water mist collides against the inner wall of the inclined exhaust pipe and the bottom surface of the arc-shaped water tank along with the airflow, and the dust is stuck by a wet dust absorption cloth; after that,the cleaned air after dust removal flows out from the exhaust port. The device does not need to consume electric power and has no noise.