The utility model discloses a cold region tunnel prevents frostbite and keeps warm and fire prevention integration facility has solved the prior art heat preservation and has needed the problem that the layering was laid, the maintenance difficulty is supported to the later stage pipe, engineering cost is high and the efficiency of construction is low with the flame retardant coating. The utility model discloses a by outer to interiorly just serve as a contrast for the tunnel in proper order, two linings in tunnel water proofing layer and the tunnel, still including the fire prevention integrative layer that keeps warm, the fire prevention keeps warm integrative layer and is formed by prefabricated district fixed the assembling of check of mill's processing, the sealed air chamber system that prefabricated district check were established by the fire prevention hoarding is done and is formed, seals up the internal division board that is equipped with the PLASTIC LAMINATED and makes of air chamber, being equipped with the installation couple on the two lining internal surfaces in the tunnel, being equipped with the draw -in groove on the lateral surface of prefabrication district check, the fire prevention keeps warm integrative layer and lays on tunnel no. 2 serves as a contrast internal surfaces with the mode of hanging the card through installation couple and draw -in groove. The dry gas seal dynamic/static testbed is simple in structure and scientific and reasonable in design.