Degradable packaging material as well as preparation method and application thereof

The degradable packaging material is prepared from the following raw materials in parts by weight: 30 to 50 parts of tobacco straw, 20 to 40 parts of waste paper fiber, 20 to 40 parts of starch, 10 to 20 parts of inorganic filler, 1 to 3 parts of foaming agent and 1 to 3 parts of plasticizer, the preparation method specifically comprises the following steps: (1) weighing the raw materials; (2) kneading the tobacco straws; (3) mixing with waste paper fibers, adding water, and uniformly dispersing; and (4) blending with starch, an inorganic filler, a foaming agent and a plasticizer, and then adding into a screw extruder to extrude and foam. The packaging material prepared by the invention has good processability and usability, and can be automatically biodegraded to finally generate CO2, H2O and humus after being discarded in the natural environment, so that the pollution of traditional plastic packaging to the environment is remarkably reduced, the development of environment-friendly packaging materials is pro