The invention relates to a production method for poly(butylene succinate-co-butylene adipate) with a low color value. The production method mainly overcomes the problem that poly(butylene succinate-co-butylene adipate) produced in the prior art has a high color value. According to the invention, a reaction product (E) of a phosphorus compound and dihydric alcohol with 2 to 10 carbon atoms is used as a heat stabilizer; and a liquid-state titanium-series catalyst used in the invention comprises a reaction product of the following raw materials: (A) a titanium compound with a general formula of Ti(OR)4, wherein R is an alkyl group with 1 to 10 carbon atoms; (B) dihydric alcohol with 2 to 10 carbon atoms; (C) at least one aliphatic organic acid selected from organic acids; and (D) at least one metallic compound selected from IA in the periodic table of elements. The production method provided by the invention overcomes the problem in the prior art and is applicable to industrial production of poly(butylene succinate-co-butylene adipate).