The invention discloses a cold gas heat insulation device for automobile refrigerating. The cold gas heat insulation device comprises a body and a shell. A first heat insulation layer is fixedly wrapped on the outer portion of a first heat insulation pipe. A second heat insulation pipe is fixedly wrapped on the outer portion of the first heat insulation layer, and a second heat insulation layer iswrapped on the outer portion of the second heat insulation pipe. A thread is formed at the end portion of one side of the second heat insulation pipe, and the end portion of one side of the second heat insulation pipe is in threaded connection with a hollow threaded rod and is connected with a compartment air outlet device through a connecting block. The hollow threaded rod is in threaded connection with the second heat insulation pipe, the outer portion of the connecting position of the hollow threaded rod and the second heat insulation pipe is fixedly sleeved and connected with a rubber sealing ring, and gas leakage at the connecting position is effectively prevented. The outer wall of the other end of the hollow threaded rod is fixedly welded to the outer wall of an air outlet of the connecting block so that the hollow threaded rod can be connected with the connecting block more tightly. Due to a layered combined connecting manner of a conveying pipe, the cold gas temperature in the pipe can be effectively ensured, meanwhile, a rubber sealing ring at the connecting position of the second heat insulation pipe and the hollow threaded rod is wrapped in a foam filling layer, and therefore leakage is avoided again.