Abstract: A length-adjustable cigar tube, comprises a tube body having a hollow center for receiving at least one cigar; the tube body being a round cylinder; one end of the tube body having an opening and other portion of the tube is sealed; an upper edge of the tube body having a flange and a recess on an outer side of the tube body and being below the flange; a cover being a tubular structure and having a cylindrical shape; the cover having a hollow interior; the hollow interior of the cover being formed with three shallow trenches; the cover being made of plastics; an inner diameter of the cover being slightly greater than an outer diameter of the tube body so that the tube body can be received into the cover tightly and the flange of the tube body being matched to one of the three trenches of the cover.