The invention discloses a water mist type dust removing device which is good in dust removing effect and high in efficiency and reduces labor intensity. The water mist type dust removing device comprises a water tank, an air inlet pipe, an air outlet pipe, a booster pump and a nozzle. The water tank is provided with a water replenishing opening, a sewage draining opening and a circulation opening. The sewage draining opening is formed in the bottom of the water tank. The water replenishing opening is formed in the upper portion of the water tank and is higher than the circulation opening. The air inlet pipe and the air outlet pipe both communicate with the water tank and are placed at the top of the water tank. The booster pump communicates with the circulating opening of the water tank. The nozzle is arranged in the air inlet pipe and is connected with the booster pump through a pressure pipe which is provided with a pressure gauge. The air inlet pipe is provided with a cohesion ring. The cohesion ring is placed below the nozzle, and the cross section of the cohesion ring is in a triangle-protruding shape. The bottoms of the air inlet pipe and the air outlet pipe are both higher than the water replenishing opening. A filtering screen is arranged at the circulation opening. The dust removing efficiency and the dust removing effect are improved, clearing is convenient, and the labor intensity is lowered.