Biodegradable resin is an efficient environment-friendly biodegradable resin manufactured by using the catalytic process and polymerization through the polycondensation of glycol and dicarboxylic acid. The molecular structure of biodegradable resin is as follows: Biodegradable resin is inert in the air but reacts with microorganisms existing in the soil, compost, river, lake and sea, making it easy to break down into water and carbon dioxide without any hazardous by-products. Biodegradable resin is particularly suitable for the following uses (1) Various disposable products that are difficult to recollect after use, i.e. film for agricultural use and port for seedling (2) Garbage bag for wastes such as food for composting being in difficulties for separating the contents from bag (3) Melt coating for packaging products that is impossible to peel off and separate (paper cup, cup noodle and inner coating of container) Biodegradable resin has mechanical and processing properties similar to general use resins (PE, PP, PS), and it can be easily molded with existing general use molders. [ When non-resoluble resin is discarded in the environment ] [ When perfectly resoluble resin is discarded in the environment ]