Device capable of fast repairing flue

A device capable of fast repairing a flue belongs to the technical field of a cold-rolled acid generation flue facility repair and is used for fast repairing the gas duct and prolonging service life of the gas duct. The technical scheme includes that the device capable of fast repairing the flue comprises two inner support rings, two outer support rings, protective supports, and protective plates, wherein the two inner support rings and the two outer support rings are respectively arranged on the inner wall and the outer wall of the flue in parallel, and specifically arranged at the upper end and the lower end of a damaged area of the flue. The left side and the right side of the damaged area of the flue are respectively provided with protective supports to connect the inner support rings at the upper end and the outer support rings at the lower end. The protective plates are coated between the inner support rings and the outer support rings, and between the protective supports. According to the device capabl