Corrosion-resistant heat-insulating layer suitable for low-temperature polyethylene steel pipe with temperature

The utility model discloses a polyethylene steel pipe anti-corrosion thermal insulation layer suitable for low temperature below-25 DEG C. The polyethylene steel pipe anti-corrosion thermal insulation layer comprises a first steel pipe, a glass wool thermal insulation layer is arranged on the surface of the first steel pipe, and an aluminum foil reflecting layer is arranged on the surface of the glass wool thermal insulation layer. The multi-directional heat preservation function of the first steel pipe can be achieved, the glass wool heat preservation and insulation layer can reduce the loss speed of the temperature in the pipe, meanwhile, the influence of the external temperature on the temperature in the pipe is greatly isolated, the aluminum foil reflection layer is matched, heat emitted by the first steel pipe is reflected, and a first layer of heat preservation defense line is formed; the polyurethane foam layer has a good heat preservation effect and can resist the influence of low temperature on the t