Sand washing machine is a washing equipment for sand and gravel (artificial sand, natural sand). Sand washing machines are widely used in the washing of materials in sand and gravel fields, mining, building materials, transportation, chemical industry, water conservancy and hydropower, concrete mixing stations and other industries. It can remove the impurities covering the surface of the sand and gravel, and at the same time destroy the water vapor layer covering the sand grains, so as to facilitate dehydration and play a high-efficiency sand washing and cleaning role.