XL screw sand washing machine, also known as sand washing machine, is divided intosingle screw sand washing machine and double screw sand washing machine, is my compan-y's use of advanced technology and combined with the actual situation of domestic sand industry development, sand washing eguipment. The utility model has the advantages of reasonable structure, high cleaning degree, lange treatment capacity and low energy consumption. The mixed sand produced by the sandmaking machine can be washed away micro amounts of stone powder and impurities so as to improve the auality of the sand and reduceb the sand loss in the sand-washing process, especially the transmission part of the mixed sand is isolated from water and water-receiving materials, failure rate is muchower than the current smmonly used.