Preparation method of completely-degradable enhanced polylactic acid/starch blend

The invention relates to a preparation method of a completely-degradable enhanced polylactic acid/starch blend. The preparation method comprises the following steps: extruding and granulating by a double-screw to obtain blended granules of polylactic acid and starch, wherein the mass ratio of polylactic acid to starch to compatibilizer is 90:10:10-60:40:10, and the blending temperature is 140-190 DEG C; extruding and granulating by a double-screw to form the biodegradable enhanced polylactic acid/starch blend system, wherein the mass ratio of blended granules to nano clay particles to thermoplastic elastic plasticizer is 65-94.5:0.5-5:5-30, and the blending temperature is 170-230 DEG C; and slicing the blend, drying, and molding by using an injection molding machine to obtain an injection-molding item or extruding to obtain sheets by using an extruder. The preparation method of the invention has the advantages of simple operation and low cost, and is suitable for large-scale production. The invention greatly