The invention relates to an online waste cigarette cut tobacco recovery system. The system comprises an automatic break-out cigarette cutting device, a cigarette machine waste cigarette collecting device, an assembling machine waste cigarette collecting device, a waste cigarette screening and straightening device, a directional and quantitative waste cigarette arranging device, a waste cigarette slicing device, a waste cigarette loosening device, a waste cigarette lifting device, a waste cigarette vibrating and screening device and an online recovered cut tobacco adding device. According to the system, through automatic break-out cigarette cutting, automatic waste cigarette collection, straightening, directional and quantitative arrangement, slicing, loosening and screening, components and quality of recovered cut tobacco are unchanged, the class of the cut tobacco is unchanged, the cut tobacco is clean and sanitary, the recovery rate of the cut tobacco is high, the recovered cut tobacco is directly added to a cigarette machine for use through a cut tobacco feeding system, the loss of the cut tobacco is effectively decreased, and the production efficiency is improved. Problems that the cut tobacco is miscellaneous, the moisture of the cut tobacco is changed, the quality is declined and the like after scattered collection, centralized treatment and treatment of different classes of cigarettes by the aid of an offline waste cigarette cut tobacco recovery production line are solved.