Sawdust screening device

The utility model belongs to the technical field of biomass fuel, and particularly discloses a sawdust screening device. The sawdust screening device comprises a connecting pipe, a left air adjusting plate is arranged at the left end of the connecting pipe and used for adjusting the opening degree of a left end opening of the connecting pipe, a material receiving hopper is arranged on the upper end face of the connecting pipe, a material blocking plate is arranged in the material receiving hopper, and a main air adjusting opening is formed in the position, located on the right side of the material receiving hopper, of the upper end face of the connecting pipe. A matched main air adjusting plate is rotationally connected to the left side edge of the main air adjusting opening, a discharging hopper is arranged at the position, corresponding to the receiving hopper, of the lower end face of the connecting pipe, and a lower air adjusting plate is arranged at the lower end of the discharging hopper and used for ad