To prevent the diffusion of water vapor and air permeability, when outside air intrudes, not only the cold consumption of the cold storage will increase, but also moisture will be brought into the warehouse. The condensation of moisture causes the building structure, especially the thermal insulation structure, to become damp and freeze damage. Therefore, a moisture-proof and thermal insulation layer must be set up so that the cold storage building has good air tightness and moisture-proof steam isolation performance.