Disclosed are a biodegradable material, and a raw material composition, a preparation method, and an application of the biodegradable material. The raw material composition of the biodegradable material comprises the following components in parts by weight: 100 parts of poly(butylene-adipate-co-terephthalate), 14.2-100 parts of polylactic acid, 14.2-100 parts of hemicellulose, 14.3-50 parts of starch, and 2.8-37.5 parts of an additive, wherein the additive comprises one or more of 0.7-5 parts of a cross-linking agent, 1.4-20 parts of a plasticizer, and 0.7-7.5 parts of a lubricant, and the cross-linking agent is one or more of dicumyl peroxide, benzoyl peroxide, and 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane. The biodegradable material and a product thereof can be completely degraded in nature, without polluting the environment; hemicellulose and starch are added into a biodegradable resin, and thus, the cost is reduced, and the mechanical properties of the product are improved; the application of hemicellulose is expanded.