Inflatable double-layer sealing device

The utility model discloses an inflatable dual-layer sealing device, comprising a ring-shaped sealing device and a strip-shaped sealing device. The sealing device in ring-shaped structure is composed of a cover plate, an upper bracket, a lower bracket, ring-shaped air bags and ring-shaped sealing strips; a lip sealing strip is pressed in a dovetail groove at the upper end of the cover plate; air bag grooves are arranged in the upper bracket and the lower bracket, the ring-shaped air bags are arranged in the air bag grooves, and air-inflating nozzles are arranged on the air bags; the ring-shaped sealing strip is arranged at one side of each ring-shaped air bag, the cover plate is fastened on the upper bracket and the lower bracket by a bolt, and the upper bracket is connected with the lower bracket into one body by a connecting bracket and the arched cover plate; a fixed baffle plate and a movable baffle plate are arranged at the two sides of the cover plate; and as to the sealing device in strip-shaped struct