The invention provides a corn washing and impurity removing device which comprises a corn wash box, a distributor, a dewatering screen, a concentrate scrapper, a pipe type elevator and a water circulation assembly. The corn wash box is used for washing and layering corn raw materials, and the corn raw materials are divided into upper-layer corn materials and lower-layer sandstone impurities. The corn raw materials enter the corn wash box through the distributor. The dewatering screen is used for dewatering corn materials discharged out of the corn wash box. The concentrate scrapper is used for conveying the corn materials treated by the dewatering screen to a preset position. The pipe type elevator is used for collecting and stacking sandstone impurities discharged out of the corn wash box. The water circulation assembly comprises a collection water bucket, a circulation water bucket and a water pump. The collection water bucket collects waste water, drained by the dewatering screen, in the corn materials and communicates with the circulation water bucket. The circulation water bucket communicates with a water inlet of the corn wash box through a pipeline. The water pump is arranged on the pipeline between the circulation water bucket and the corn wash box. The corn washing and impurity removing device has the beneficial technical effects of being reasonable in structure, convenient to use and efficient and saving water resources.