Citrus fruit， one of the most widely cultivated fruits globally， is highly perishable. Traditional packaging films are no longer sufficient to fully prevent its infection by pathogenic and spoilage microorganisms. Furthermore， non-biodegradable packaging films pose a serious threat to the Earth's ecosystem. To solve the above problems， this study successfully prepared polybutylene adipate terephthalate /polylactic acid/ curcumin (PBAT/PLA/Cur) composite films using degradable materials. The results showed that the photodynamic bactericidal effect of the Cur composite film against Penicillium digitatum， Salmonella Typhimurium and Listeria monocytogenes reached 99%. By scanning electron microscopy (SEM)， X-ray diffraction (XRD)， Fourier transform infrared spectroscopy (FTIR)， differential scanning calorimetry (DSC)， mechanical properties and other tests， it was found that the Cur composite film has a uniform microporous structure and excellent tensile properties. The average pore sizes of PBAT/PLA/0.5%Cur films were (222±64)， (275±83)， (356±89) nm， respectively. The tensile strength of PBAT/PLA/0.5% CUR films could reach (7.35±2.1) MPa， and the elongation at break could reach (333±19)%. In addition， the CUR-compound thin-wrapped citrus fruit has a low water loss rate， the spoilage rate of the citrus after inoculation with P. digitatum is reduced by 60%， and the shelf life can be extended for 3 days. In summary， the Cur composite film can effectively maintain the quality of citrus， improve the storage resistance of citrus fruit， and have broad application prospects in the field of citrus preservation.

curcumin  /  packaging film  /  biodegradable  /  citrus  /  preservation