The integral insulation joint consists of the following parts: upper and lower tubes, sleeves, insulation, seals and insulating coatings. An insulating member and a seal are clamped between the upper end of the insulating joint and the lower end of the lower pipe to form a double sealing structure with insulating property. The sleeve adopts the welding and welding or catheter directed two forms, insulating parts and the upper and lower sealing tube firmly wrapped inside, forming a "sealed container", which not only ensures good insulating performance, but also greatly improve the bearing capacity of the insulation structure. The integral insulation joint consists of the following parts: upper and lower tubes, sleeves, insulation, seals and insulating coatings. An insulating member and a seal are clamped between the upper end of the insulating joint and the lower end of the lower pipe to form a double sealing structure with insulating property. The sleeve adopts the welding and welding or catheter directed two forms, insulating parts and the upper and lower sealing tube firmly wrapped inside, forming a "sealed container", which not only ensures good insulating performance, but also greatly improve the bearing capacity of the insulation structure