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In this context, a novel recycling strategy for the upcycling of waste biodegradable plastics, specifically PBAT, has been proposed. This approach initially employs a 1,4-butanediol-alkali method to rapidly hydrolyze PBAT without introducing other impurities. Following this, a two-step synthesis process is employed to swiftly create a foam nickel-supported NiOOH electrocatalyst. This catalyst efficiently converts the hydrolyzed solution of 1,4-butanediol into the higher-value product, succinic acid, achieving a Faraday efficiency of 97.6% along with satisfactory stability. [Display omitted] • A novel method was employed for the rapid catalytic degradation of PBAT. • A versatile foam nickel-supported NiOOH electrocatalyst was synthesized quickly. • The conversion of PBAT hydrolysis solution into high-value succinic acid. • The oxidative mechanism of 1,4-butanediol by the catalyst was elucidated. Biodegradable plastics such as Poly (butylene adipate-co-terephthalate) (PBAT) have been extensively utilized in numerous fields. However, post-consumption, PBAT tends to pollute the environment and waste resources. Herein, a novel approach employing a 1,4-butanediol-alkali combined method for the hydrolysis of PBAT is introduced. At 130 °C, with a reaction time of 60 min, the hydrolysis rate of PBAT exceeds 99 %. Subsequently, a two-step synthesis rapidly produces a foam nickel-supported NiOOH catalyst for the electrocatalytic reformation of the PBAT hydrolysate into higher-value chemicals (succinate salts) at an impressive current density of 100 mA cm−2 at 1.43 V (vs. RHE) and a Faradaic efficiency of 97.6 %. Experimental results and density functional theory calculations have elucidated the active state changes of the foam nickel-supported NiOOH catalyst and the intermediates in the oxidation of 1,4-butanediol to succinate, alongside the reaction mechanism. This study offers a viable approach for the degradation of PBAT plastic through a 1,4-butanediol-alkali method and the rapid preparation of a foam nickel-supported NiOOH electrocatalyst, achieving the upgraded recycling of post-consumer biodegradable PBAT plastic. [ABSTRACT FROM AUTHOR]