This production line is machine used for producing plastic hard flat nets which use PE, PP as the main raw material. It can produce many kinds of different structure and specifications nets through changing die bushing and calibrating device. These nets is widely used as mattress interlayer, Dams landslide prevention, roadbed reinforcement, plant stents, mine overhead guards and widely use in animal husbandry and the aquaculture. It can use as roadbed and dam slope protection vegetation through forming to geotechnical 3d nets by three layers of composite technology.