The invention provides a method for preparing a degradable packaging material, which prepares finished products by using rice husks, corn bones and reclaimed plastics as base materials and by the steps of preparing raw materials, grinding, mixing, sterilizing, kneading, granulating, extruding, forming, blistering and qualifying and other steps. The degradable packaging material has the advantagesof low cost, full utilization of sources, environment friendliness and the like. In a preparation process, chemical reactions happen to form a highly-mixed microstructure, so that the finished product has high mechanical strength, high softness and high heat resistance.