The work aims to conduct artificial accelerated aging test on poly (terephthalic acid-adipic acid-butylene) (PBAT) agricultural film to clarify the aging law of PBAT agricultural film under light oxygenphotooxidation condition. Artificial accelerated aging test of PBAT agricultural film was conducted for 168, 336, 504 and 672 h with an artificial accelerated xenon lamp aging tester, and the effects of aging time on the structure and thermal stability of PBAT were analyzed. The results showed that with the increase of aging time, the hydroxyl index and chain scission index of the samples increased, while the carbonyl index decreased, the crystalline structure was gradually destroyed, and the thermal stability became worse. According to the results of SEM, with the increase of aging time, holes gradually appeared on the surface of the sample and showed considerable brittleness. And the structure of the sample was gradually damaged. On the whole, PBAT produces a series of aging phenomena under the action of photooxidation and hydrolysis, and the structure and properties of the samples are greatly damaged.