The integral insulation joint is composed of the following parts: the upper and the lower pipe, the sleeve, the insulation, the seal and the insulating coating. An insulating part and a sealing piece are clamped between the upper and the lower ends of the butt joint of the insulating joint. 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