The invention provides a product prepared from an additive type biodegradable composition. The product is prepared by the following steps: grinding sodium sulfate or a starch material until powder with a size over 1000 meshes is obtained, then adding synthesized biodegradable resin as the main raw material and other additives, mixing, stirring the mixture in a high-low temperature boiler in a high speed until the mixture becomes paste, then kneading the paste in a kneading machine, cooling to obtain blocks, transferring the blocks to a granulating machine to carry out mixing and granulating, cooling the granules by water, cutting and forming to obtain biodegradable composition particles, and finally making the biodegradable composition particles into biodegradable products such as bags, tableware, and the like. The product has the advantages of high heat resistant temperature, high transparency, low cost, and easy degradation, can be degraded in nature, and will not pollute the environment.