The invention discloses a cleaning and precipitating device for maize meal. The cleaning and precipitating device comprises a cabin, a cabin cover and water outlets. The cabin cover is installed at the top of the cabin, an air floater is arranged on the cabin cover, one end of the air floater stretches into the lower end in the cabin, a feeding port is formed in an upper opening of the cabin, the first water outlet, the second water outlet and the third water outlet which are spaced by a certain size are formed in the side wall of the cabin in the vertical direction, and a first water conveying pipeline, a second water conveying pipeline and a third water conveying pipeline matched with the first water outlet, the second water outlet and the third water outlet respectively are arranged on the side wall of the cabin. During cleaning, fine impurities in the maize meal can be separated and float on the upper layer, cleaning is complete, working time is reduced, working efficiency is improved, water outflow is accelerated, waste of the maize meal is avoided, and the unit production unit is reduced for a user.