At present, most of the equipment used in the PE double wall corrugated pipe extrusion are the single screw extruder or conical counter-rotating twin screw extruder. Although these two kinds of equipment have their own advantages, they still have the problems of low output and high energy consumption, while the conical co-rotating twin screw extruder have the characteristics of large extrusion force and good plastic performance, and the energy saving effect is remarkable.