It is formed to heat preservation and anticorrosion coating by coinstantaneous coated the anticorrosion coating, insulation laver and thermal insulation protective layer on the outer wall of the steel pipeline. Compared with other methods, it has many outstanding advantages such as continuous operation, high production efficiency, low costs, energy saving, no pollution and so on. This production line adopts a one-step forming method, and the raw material pipes to the insulation pipes can be directly processed in one step, which can greatly save costs and improve production efficiency. This technology is the first in the world and is in the leading level in the world.