The composition of total-biodegraded thermoplastic starch resin includes (by weight portion) starch 50.0-75.0, blend A 5.0-20.0, blend B 10.0-20.0 graft modifier 1.0-5.0, chemical initiator 0.1-1.0, plasticizer 2.0-10.0, covering agent 0.3-3.0 and antioxidant 0.1-2.0, in which the blend A is one kind of more than one kind of thermoplastic resin, and the blend B is one kind of more than one kind of cellulose, polyvinyl alcohol, polyglycolic acid and polyester, and its graft modifier is one or more than one kind of long-chain unsaturated carboxylic acid and its ester. It can be directly used for making various tableware, cup, disk, film and package products, etc.