This extrusion line is suitable for producing co-extrusion PP/PE WPC deck-ing. The decking surface can be made into wood grain by co-extruder. Furthermore, themachine can be equipped with on-line embossing device, the surface can be made into3D wood grain. The WPC decking has a series of advantages including water-proof, insect prevention, ageing resistant, easy installation, environment friendly and good weathering resistance.