Working process: The pump slurry sand water mixture is transported to the mud sand high-pressure separator. The fine sand that is centrifuged and concentrated is provided to the dewatering screen through the sand settling nozzle. After dewatering by the dewatering screen, the fine sand and water are effectively separated. A small amount of fine sand, mud, etc. are returned to the cleaning tank through the return bin. When the liquid level in the cleaning tank is too high, they are discharged through the discharge port. The weight concentration of the recovered material through dehydration screening is 70% -85%. Adjusting the fineness modulus can be achieved by changing the pump speed, changing the mortar concentration, adjusting the overflow water volume, and replacing the mortar nozzle. Thus completing three functions: cleaning, dehydration, and grading.