The invention relates to a pollutant discharging device and double gas curtain oil fume extractor using the same. The pollutant discharging device comprises a first blowing device, a second blowing device and a gas sucking cover, wherein the first blowing device and the second blowing device are respectively provided with a first long blowing end and a second long blowing end which are arranged in parallel on the front and rear sides of the surface of a platform or a furnace platform and respectively spray air jet streams upwards, the gas sucking cover is arranged on a position which has a distance above the surface of the platform or the furnace platform and is provided with at least one long gas sucking end with a downward opening, and the gas sucking end is connected with a gas extractor to form upward suction force and is parallel to the first and second long blowing ends. When the gas extractor operates, two gas curtains which are close to two-dimension are formed between the gassucking end and the first and second long blowing ends so as to discharge oil fume or harmful gas surrounded between the two gas curtains, thereby the dissipation of pollutant is reduced, and the surrounding rough air resistance is increased.