This study investigates the enhanced biodegradation of poly(butylene adipate-co-terephthalate) (PBAT) composites using reed fiber (RF). PBAT is a biodegradable polyester with promising properties for replacing traditional plastics. The addition of reed fiber significantly improves the biodegradation rate of PBAT. Enzymatic degradation tests using lipase, cellulase, proteinase K, and esterase showed that lipase had the most significant impact on the degradation rate, with PBAT/RF composites showing a higher weight loss (8.17%) compared to pure PBAT (5.63%) after 15 days. The composites exhibited increased surface hydrophilicity, which enhanced their degradation capacity. Composting tests under controlled conditions revealed that PBAT/RF composites degraded more easily than pure PBAT. The lag phase of PBAT/RF decreased by 23.8%, and the biodegradation rate increased by 11.8% over 91 days. Scanning electron microscopy (SEM) analysis showed that the surface of PBAT/RF composites developed more cracks and pores during degradation, increasing the contact area with microorganisms and accelerating degradation. Fourier transform infrared (FTIR) analysis indicated a weakening of the ester bond peaks in the composites, confirming the breakdown of the polymer chains. Differential scanning calorimetry (DSC) results showed an increase in melting temperature and crystallinity over time, especially in the PBAT/RF composites. The study highlights the potential of reed fiber as a natural filler in PBAT composites, enhancing their biodegradability and making them more sustainable. The findings suggest that PBAT/RF composites can serve as an effective alternative to petroleum-based plastics in various applications, including construction, biomedical, and eco-friendly packaging. This research contributes to the development of environmentally friendly materials with improved degradation properties.This study investigates the enhanced biodegradation of poly(butylene adipate-co-terephthalate) (PBAT) composites using reed fiber (RF). PBAT is a biodegradable polyester with promising properties for replacing traditional plastics. The addition of reed fiber significantly improves the biodegradation rate of PBAT. Enzymatic degradation tests using lipase, cellulase, proteinase K, and esterase showed that lipase had the most significant impact on the degradation rate, with PBAT/RF composites showing a higher weight loss (8.17%) compared to pure PBAT (5.63%) after 15 days. The composites exhibited increased surface hydrophilicity, which enhanced their degradation capacity. Composting tests under controlled conditions revealed that PBAT/RF composites degraded more easily than pure PBAT. The lag phase of PBAT/RF decreased by 23.8%, and the biodegradation rate increased by 11.8% over 91 days. Scanning electron microscopy (SEM) analysis showed that the surface of PBAT/RF composites developed more cracks and pores during degradation, increasing the contact area with microorganisms and accelerating degradation. Fourier transform infrared (FTIR) analysis indicated a weakening of the ester bond peaks in the composites, confirming the breakdown of the polymer chains. Differential scanning calorimetry (DSC) results showed an increase in melting temperature and crystallinity over time, especially in the PBAT/RF composites. The study highlights the potential of reed fiber as a natural filler in PBAT composites, enhancing their biodegradability and making them more sustainable. The findings suggest that PBAT/RF composites can serve as an effective alternative to petroleum-based plastics in various applications, including construction, biomedical, and eco-friendly packaging. This research contributes to the development of environmentally friendly materials with improved degradation properties.