Buried pressure-resistant heat preservation pipeline

The utility model discloses a buried pressure-resistant heat preservation pipeline. The device comprises an outer heat-insulating pipe, an annular supporting frame, a sealing cover and an inner heat-insulating pipe, a heat preservation layer is arranged on the inner side wall of the outer heat insulation pipe; annular supporting frames are evenly arranged in the heat preservation layer. An inner heat insulation pipe is fixed between the sleeve holes; and a flowing cavity is formed in the inner heat insulation pipe, connecting rods are arranged between the inserting holes, meanwhile, limiting rings are fixed between the annular supporting frames, sealing covers are arranged on the two sides of the outer heat insulation pipe, sealing rings are arranged between the sealing covers and the outer heat insulation pipe, and an exhaust pipe is arranged at the top end of the outer heat insulation pipe. According to the heat preservation pipeline, the heat preservation layer is arranged, the sponge layer is arranged in