The set has the characteristics of high speed extrusion, high efficient plasticization etc with polyolefin special single screw extruder. The special polyolefin applies the separator type mixing screw pole.The especially designed three coextrusion die heads has rational runner. The inwall of the pipe is smooth with small interior stress. The production pipe diameter ranges 20-160 mm.The production speed can reach at 16 meters per minute.The set can be universally used with several purposes to make HDPE silicon pipe,common PP-R,PE,PEX pipe.It has low cost: nanometer anti-bacteria tubes’ cost merely increases 5-10% than ordinary pipe.