There is provided an infrared-ray lamp tube comprising； an elongate tube-shaped housing having an inner space defined therein, wherein the elongate tube-shaped housing have both side open ends； an infrared-ray emitting array disposed in the inner space, wherein an infrared-ray emitting array includes a plurality of halogen lamp units spacedly arranged in an array in the inner space in a length direction of the housing； two plugs respectively fitted into the both side open ends of the elongate tube-shaped housing； and a filtering liquid filling the inner space of the elongate tube-shaped housing.
