The invention discloses a barrel-type fermentation method for cigar tobacco leaves. The barrel-type fermentation method includes the steps of performing processes of tobacco leave moistening and moisture regaining on raw tobacco leaves, accommodating the tobacco leaves obtained from the processes of tobacco leave moistening and moisture regaining in a wooden barrel and placing the wooden barrel into a fermentation chamber, fermenting for a 20-40 days. The cigar tobacco leaves fermented by the method are remarkably low in nicotine, intrinsic irritation of the tobacco leaves is improved, and intrinsic bitter taste of the tobacco leaves is eliminated.