Micro powder sorting machine

The utility model relates to a micro powder grading machine which comprises a rotating blade wheel, a container shell and a central rotary shaft. The rotating blade wheel is fixed on the rotating shaft that is situated in the center of the container shell. The upper end of the container shell is provided with a material powder inlet, a material powder disperser and a distributor. The lateral surface of the container shell has a high pressure air inlet. The upper end face of the rotating blade wheel is provided with annular slots or holes, and a perforated plate covers the annular slots or the holes. The external side of the rotating blade wheel has a coarse powder outlet, and the center has a fine powder outlet. Material powder enter the annular slots or the holes through the perforated plate and then enter the rotating blade wheel for grading. The utility model has simple structure and favorable effect.