Designed a reconstituted cut tobacco cutting-winnowing system. The system is constituted of feeding apparatus, cutting apparatus and winnowing apparatus. The system adopts integration design, twice-cutting apparatus, integrated blade, flywheel and back-taper air separator. The tobacco shred is cut by using the speed difference between the fast and slow knife discs to form a "cut" effect, and purification and dust removal is done by system sealing and air selection and air supply system. Compared to before the cut, twice-cutting design make a 29.06% decrease of long cut tobacco (length ＞20 mm) and a 0.12% increase of scrap tobacco (length ＜ 5 mm).