At present, hot briquetting technology is normally used in domestic and overseas research of biomass packing materials which are prepared with starch, fiber and plasticizing agent as the base materials. Due to its production inefficiency and environmentally harmful elements in raw materials, by adopting orthogonal experiment method, the optimal extruding process and formula for continually producible biomass packing materials were researched by taking the green paper fiber, starch biomass material and glycerol as raw materials. The results showed: the best formula for producing biomass packaging materials was with 11% starch, 11% glycerol and 78% recycled paper fiber, with 80% moisture in raw materials. The optimal process was under the condition of three section temperature of the extruder being set at 65 ℃, 65 ℃, 80 ℃ respectively and the screw rotation speed being 50 r/min. With the optimal formula and process condition, the produced biomass packaging material sample had an optimal performance and it could be continually produced.