An adhesive tape holder comprising a base cylinder constituted by two cylinders releasably connected together end by end. Each of the cylinders has an extension and the ends of the extensions are connected together by a knife seat with a saw-like knife mounted thereon. One of the extensions is constituted by two parts hinged together so that the cylinder associated therewith can be released and open to have a roll of adhesive tape disposed on the base cylinder. The saw-like knife is covered by a slidable safety lid to prevent the knife from hurting the user when not in use. Attached on one of the extensions is a tape tip retaining post which is rotatable in one direction so as to prevent the tape tip from losing contact with the post.