The BX fine sand recovery machine's main components consist of a motor, a high-pressure vacuum pump, a sediment separator, a ZKR dewatering screen, a cleaning tank, and a return tank. During operation, the pump pumps a slurry, sand, and water mixture into the sediment separator. Tailings, which have been centrifugally graded, are then fed to the dewatering screen via a sand settling nozzle. After dewatering, the tailings are effectively separated from the water. A small amount of tailings and mud are returned to the cleaning tank via the return tank. If the liquid level in the cleaning tank is too high, the sand is discharged through the discharge port. The material recovered by the dewatering screen has a weight concentration of 70%-85%. The fineness modulus can be adjusted by varying the pump speed, slurry concentration, overflow water volume, or by replacing the slurry discharge nozzle. This completes the three functions of cleaning, dewatering, and grading.