The spiral sand washing machine can clean and separate the soil and debris in the sand and stone. Its novel sealing structure, adjustable overflow weir plate and reliable transmission device ensure the effect of cleaning and dewatering. It is widely used in washing, grading and impurity removal of highway, hydropower, construction and other industries, as well as the washing of fine-grained and coarse-grained materials, especially suitable for construction and road construction. Spiral stone washing machine is used for desliming and screening of a large amount of sand and stone used in construction sites, sand and gravel factories, prefabrication plants and hydropower construction sites, and also for ore dressing. It can effectively handle materials within 0-30mm, and can separate the soil and ash powder on the materials into clean materials. This machine has the advantages of simple structure, easy maintenance and high washing efficiency. Spiral sand washing machine is divided into double screw and single screw. Compared with the single screw sand washing machine, the double screw stone washing machine has the advantages of high efficiency and large output, and can handle materials within 0-30 mm.