It is a single stage extruding and foaming equipment with large L/D. It takes polyethylene resin with low density as raw material, injects shrinking proof agent and foaming agent with high pressure in extruding process, through screw plasticizing and mixing, extrudes from dies, cools and forms into foaming product. It is the most ideal physical PE forming unit in the world. It has continuous stable performance with big capacity, wide range of foaming ratio, high automation and reliablity.