Low temperature insulating tube

The utility model discloses a low temperature insulating tube and belongs to the technical field of LNG. According to the low temperature insulating tube disclosed by the utility model, an Alles material is laid on the surface of a steel tube to form an inner Alles insulating layer; an outer insulating layer PIR profile layer is arranged outside the inner Alles insulating layer; a clearance between the inner Alles insulating layer and the an outer insulating layer PIR profile layer is filled with a polyurethane foamed insulating layer; the three layers form a heat insulating layer on the surface of the steel tube. The low temperature insulating tube disclosed by the utility model is reasonable in structure, capable of obviously improving the heat insulation effect of a product, simultaneously quite simple in preparation method and capable of being conveniently and effectively maintained once a pipeline is ineffective in heat insulation so as to guarantee normal operation of equipment.