Material on site sorting machine

The utility model relates to a material on site sorting machine which comprises a box body, wherein the box body is provided with a feeding opening, an air sucking opening and an air inlet. An air separating chamber and a settling chamber are arranged in the box body; the air speed of the settling chamber is below that of the air separating chamber; the air separating chamber is communicated with the top part of the settling chamber. The feeding opening is arranged at the middle-lower part of the air separating chamber, the air inlet is arranged at the bottom part of the air separating chamber. An air door which can adjust the sectional plane of an air passage is installed at the point of the air inlet. A screen plate is installed in the settling chamber. The box body is provided with the air sucking opening on the upper side of the screen plate, and a discharging opening is arranged at the lower part of the settling chamber. A discharging air lock is installed at the point of the discharging opening. An air guiding plate which can adjust the sectional plane of the air passage is installed at the point of an inlet of the air passage of the settling chamber. The utility model has the characteristics of low energy consumption, high separating efficiency and low tobacco breaking rate.