Sand washing machinery drives the impeller in the water groove to move like a circle transmitted by electric motors and decelerator, and then mixes, overturns, Cleans and discharges the sand or slag pellets in the water groove. It is of simple structure. The bearing device of impeller drive is separated from water and materials with water, to avoid in a large degree that the bearings are damaged by being soaked with water, sand or some polluted things. When it is used for cleaning sand in quarries, it has many advantages Compared with the traditional spiral one. There is little loss for medium-sized and fine sand and stone powder. The grade and the fineness of the sand for construction after being washed can be up to the national standards, such as "sand for construction" and "cobble and broken stones for construction".