The machine is made up of transmission gear, rotor of the principal axis and crust, the thick and fine materials are separated because of the centrifugal force produced by rotation, when the material goes from the inlet into the propeller scattering pan, the material has different quality generates different centrifugal force, the fine particle because of its small quality, in the operation of ascending air of high speed rotation, departs from the scattering pan and goes up with ascending air and quickly enters into the outside shell, at last it falls to the discharge gate and outing. The thick particle settles down by the gravity and centrifugal force, at last it falls to the discharge gate and outing. The thick particle settles down by the gravity and centrifugal force, at last it vents from the wide discharge gate through the inner casing.