Sweet potato cleaning according to the soil quality selection of suitable cleaning facilities, roughly summarized as follows: sandy land with a lot of ordinary selection of semi-automatic feeding washing machine single can. Mud land selection of potato washing machine should be two, cage washing machine for cleaning sweet potato surface number of sand, semi-automatic feeding washing machine for fine washing to remove sweet potato roots, cortex, concave mud. Finished cleaning sweet potato semi-automatic into the crusher for decomposition, crushed slurry slag into the cylinder clutch machine for clutching, clutching the local three over the shower put forward to obtain a high rate, after the clutching of slag basically does not contain water. Small powder slurry in the clutch after the introduction of sand remover to remove impurities in the small powder, sand growth in the quality of small powder. After removing sand, it directly enters into the refining machine to carry out refinement. At this time, the small powder to carry out precipitation disposal can also be through the cyclone station to carry out the concentration. Concentration of small powder into the dewatering machine to deal with nutrients, dewatering small powder containing nutrients about 38-40% or so, into the baking machine to carry out the drying process. The complete set to die the river plane contact line operation production, semi-automation deep.