The utility model relates to an air classifier of tobacco. The machine comprises a classification canister, a vibrating screen and a conveyor belt. Wherein, a tobacco outlet is arranged at the upper end of the classification canister, a air inlet net is provided on the side of the classification canister, and the side is also connected with the vibrating screen above the air inlet net. The bottom of the classification canister is connected with an air inlet and a strainer. The vibrating screen sends tobacco into the classification canister, and the tobacco will be blown out of the outlet by the air from the side and bottom after dropping along a parabola, with the tobacco peduncle and impurities dropping through the strainer on the belt conveyer and be transferred out.