The invention discloses a device and method for automatically selecting tobacco leaves for producing cut tobacco. The device comprises a rolled tobacco leaf removing system, a tobacco stem detecting and removing system, a detecting and removing system for green tobacco leaves and moldy tobacco leaves, an impurity removing system and a tobacco leaf conveyor. Raw tobacco leaves enter the rolled tobacco leaf removing system from an inlet of the rolled tobacco leaf removing system and rolled tobacco leaves are removed; unrolled tobacco leaves are output from the tobacco stem detecting and removing system and the tobacco leaves with the tobacco stems and impurities are detected by the tobacco stem detecting and removing device; the green tobacco leaves and the moldy tobacco leaves with the impurities are separated out by the green tobacco and moldy tobacco detecting and removing system and are removed through a removing mechanism; after the green tobacco leaves and the moldy tobacco leaves are removed, the tobacco leaves enter the impurity removing system, the tobacco leaves are accelerated by the impurity removing system, the impurities are removed, the tobacco leaves obtained after the impurities are removed are conveyed to a tobacco leaf collecting device through the tobacco leaf conveyor, and selection of the tobacco leaves is achieved. The device and method for automatically selecting the tobacco leaves for the cut tobacco are easy to conduct, the tobacco leaf selecting efficiency is high, and the automatic degree is high.