It is used for soft connection of fire fighting, smoke control and high temperature fan mouth, made of high temperature resistant material, and is specially used for soft connection of smoke control and exhaust fan inlet and outlet and exhaust pipeline. When a fire occurs, the incombustibility of the soft connection prevents the soft connection from being burned by the fire, ensures the operation of the smoke exhaust duct, and achieves the purpose of smoke exhaust. The application of this product greatly reduces the personal injury caused by fire, and it is an indispensable part of fire smoke exhaust system in buildings, civil air defense projects, subway projects, public places, ships and so on. The fireproof soft connection has the advantages of anticorrosion, shock absorption, incombustibility and good sealing.