PE & PP gas pipe production line is mainly used in the production of agricultural drainage, construction drainage, laying cable etc. The unit comprises an extruder, a vacuum calibrating bench, a tractor, a cutting machine, and a double rack etc. The single screw extruder and the tractor adopt imported variable frequency speed regulating device, the vacuum pump and traction motor adopt high-quality products. Tractors have two-claw type, three-claw type, four-claw type, six-claw type, eight-claw type, ten-claw type, twelve-claw type etc. Chip-free cutting machine, saw blade cutting machine or planetary cutting machine can be applied, with reliable performance and high production efficiency. The planetary cutting machine is controlled automatically with computer, it has such advantages of simple operation, reliable performance etc. It has reached international advanced level.