The die head adopts gradual water drop-shaped flat-shoulder type runner, combined with triangle shunting technology and Stepped Steady Flow, which effectively eliminates die mouth deformation caused by high pressure during extrusion process. The upper die lip is manually pushed to fine adjust the elastic die lip, the adjustment is accurate, the plane type throttle rod, can eliminate the material to detain, solves because stays too long to cause the decomposition. The lower die lip can be changed, and the die lip with different opening can be equipped according to different thickness. Suitable for the production of PC, PS, PP, PE, Pla, PVC and other single or multi-layer plate./n/n