The utility model discloses a middle package toasts updraft ventilator, including well packet of quick change mechanism, well packet of quick change mechanism includes the guide rail, the slide, slide and guide rail cooperation, the slide is equipped with vertical hole, the bottom skateboard deck and the upper end of connecting pipe no. 1 of slide are connected, the lower extreme and the upper end of connecting pipe no. 2 of connecting pipe no. 1 are connected, the inside of connecting pipe no. 1 and the inside intercommunication of connecting pipe no. 2, a connecting pipe size is greater than the size of connecting pipe no. 2, the lateral wall of connecting pipe no. 1 is equipped with horizontal through -hole, sealing connection's air -supply line is equipped with at horizontal through -hole, the air -supply line is including the horizontal segment and the vertical section that are connected, the outer end of horizontal segment is outwardly directed from horizontal through -hole, the outer end and the highly -compressed air pipe connection of horizontal segment, open side down for the vertical section, the lower beginning of vertical section is downward. The utility model discloses high -efficient simple and easy, convenient operation, it is little that the exhaust vortex influence resistance, forms better negative pressure effect, flame and take out and draw, has reduced the molten steel and toasted the bad partial caking condition at the centre package, effective improve middle wrap toast the effect.