[Solution] A method for synthesizing poly (butylene succinate-co-adipic acid) (PBSA) by a kind of biomass creatinine catalysis method, and using succinic acid, adipic acid and 1,4-butanediol as raw materials As a high-efficiency composite catalyst system composed of biomass biomimetic organic guanidine / creatinine compounds (main catalyst) and orthotitanate (cocatalyst). Features of the present invention: The catalyst system of both components has high catalyst efficiency, uses a small amount of catalyst, and is 1 / 10,000 to 1 / 10,000 of the raw material that is slightly added. A certain residual catalyst was greatly reduced, the stability of the material was improved, and in addition, the application range in the fields of food, medicine and agriculture was expanded, and the production cost was reduced. [Selection figure] None
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