Degradable green environmental protection food package material and preparation method therefor

The invention provides a degradable green environmental protection food package material and a preparation method therefor. The material comprises the following components, by weight, 50-60 parts of polylactic acid, 20-30 parts of starch, 10-20 parts of polyhydroxyalkanoate, 10-20 parts of chitin, 5-10 parts of chitosan, 5-10 parts of citric acid, 10-15 parts of poly(butylene succinate), 5-10 parts of methanamide, 1-5 parts of sorbitol, 1-5 parts of silane coupling agent, 1-5 parts of antioxidant, 1-5 parts of plasticizer, 1-5 parts of cross-linking agent and 40-60 parts of water. The provided material can be suitable for food package and is advantaged by reasonable component composition, environmental protection, no toxicity and short degradation cycle, and degraded substances are friendly to the environment and have no damage to soil. The provided food package material has high intensity and high toughness, has a low production cost, is beneficial for market popularization, and has good economic benefits.