This study investigates the enhancement of biodegradability in poly(butylene adipate-co-terephthalate) (PBAT) composites by blending with reed fiber (RF). The degradation of PBAT and PBAT/RF composites was evaluated using various enzymes (lipase, cellulase, Proteinase K, and esterase) and under controlled composting conditions. The results show that the addition of reed fiber increases the surface hydrophilicity of the composites, enhancing their degradation capacity. Lipase had the most significant impact on the degradation rate, with a weight loss of 8.17% compared to 5.63% for neat PBAT. DSC analysis revealed an increase in melting temperature and crystallinity over time, particularly in the PBAT/RF composites. FTIR analysis indicated a weakening of the ester bond peak in the samples. Under composting conditions, PBAT/RF composites degraded more easily than neat PBAT, with a 23.8% reduction in the lag phase and an 11.8% increase in the biodegradation rate over 91 days. SEM analysis showed more cracks and pores on the surface of PBAT/RF composites, increasing the contact area with microorganisms and accelerating degradation. This research highlights the potential of PBAT/RF composites as highly degradable materials for applications in construction, biomedical, and environmental packaging.This study investigates the enhancement of biodegradability in poly(butylene adipate-co-terephthalate) (PBAT) composites by blending with reed fiber (RF). The degradation of PBAT and PBAT/RF composites was evaluated using various enzymes (lipase, cellulase, Proteinase K, and esterase) and under controlled composting conditions. The results show that the addition of reed fiber increases the surface hydrophilicity of the composites, enhancing their degradation capacity. Lipase had the most significant impact on the degradation rate, with a weight loss of 8.17% compared to 5.63% for neat PBAT. DSC analysis revealed an increase in melting temperature and crystallinity over time, particularly in the PBAT/RF composites. FTIR analysis indicated a weakening of the ester bond peak in the samples. Under composting conditions, PBAT/RF composites degraded more easily than neat PBAT, with a 23.8% reduction in the lag phase and an 11.8% increase in the biodegradation rate over 91 days. SEM analysis showed more cracks and pores on the surface of PBAT/RF composites, increasing the contact area with microorganisms and accelerating degradation. This research highlights the potential of PBAT/RF composites as highly degradable materials for applications in construction, biomedical, and environmental packaging.