This plastic pipe line is used to produce butt welded PE-X/Al/PE-X multi-layer pipe, which is a kind of high performance pipe integrating advantages of plastic pipe and metal pipe. This kind of pipe has advantages of corrosion-resistance, high temperature resistance, excellent barrier property, easy to install, high reliability, high pressure resistance, etc. It is mainly used in transportation of hot and cold water, gas, as well as geothermal pipe laying.