The invention provides a biodegradable thermoplastic starch resin for a thin-film material, a preparation method thereof and products thereof. The resin comprises the following components in part by weight: 50 to 60 parts of food grade starch, 15 to 20 parts of glycerol, 3 to 10 parts of butanediol, 0.1 to 0.5 part of stearic acid, 0.2 to 0.8 part of calcium stearate, 1.8 to 2.5 parts of monoglyceride, 15 to 25 parts of ethyl-methyl acrylate copolymer and 1 to 10 parts of low-density polyethylene. Compared with the traditional biodegradable thermoplastic starch resin, the biodegradable thermoplastic starch resin provided by the invention has the advantages of good processing performance, high biomass content, high biodegradation rate, very good thermal bonding performance and leakage-proof performance. The biodegradable thermoplastic starch resin can be used for manufacturing bath curtains, sleeves, films, medical bed spreads, surgical pads, disposable gloves, diapers, sanitary towels, table linens or table cloth.