The utility model discloses an air current decline formula bulk curer's power failure emergency device, including roast room, roast room is provided with the cold wind air inlet door who connects theheating chamber, set up emergent air inlet mechanism on each cold wind air inlet door in roast room, and emergent air inlet mechanism be in examine the room in, the heat preservation top in roast roomsets up emergent hydrofuge mechanism respectively with the four corners that the side wall joins mutually, the lower part and the top in roast room do not set up emergent warm and humid inductor, emergent air inlet mechanism, emergent hydrofuge mechanism and emergent equal electrical connection control device of warm and humid inductor and battery. The utility model discloses in that have a powerfailure or during the outage, the emergent air inlet mechanism of controlling means control in time closes the cold wind air inlet door's in roast room air inlet, the accent wet plate that adjusts cold wind door air inlet and the emergent hydrofuge mechanism size that opens and shuts realizes the traffic direction of hot gas flow in the roast room of adjustment to form the self -loopa effect thatthe air current rises and descends naturally, reduce the roast bad rate of tobacco leaf, reach the purpose of putting forward matter and falling the damage, further promote economic benefits.