Biodegradable Sheet Extruder Process innovation: (1) The material microwave irradiation mixing technology is adopted to replace the conventional high-mix, devolatilization heating method. Due to the shortening of the heating method and the reaction time, the unit's sublimation and performance are reduced, and the reaction yield is effectively improved. (2) Adopt continuous miniaturization technology to make starch particle size ≤8um. (3) The mixing and extruding equipment with high aspect ratio, high shear and special screw combination makes the starch content of CSPII series biomaterials as high as 85% or more. And improve the compatibility of biomaterials and cross fusion.