The work aims to explore the functional modifications of poly (lactic acid) (PLA) through the incorporation of complex MOF-199 and study the effect of MOF-199 with different concentrations on the properties of PLA films. MOF-199/PLA composite films were prepared by solution blending and film casting method. The surface morphology and chemical structure of the composite films were characterized by scanning electron microscope (SEM) and flourier trans-formation infrared spectroscopy (IR) spectrum. The color difference test, transmittance/haze test, mechanical measurement, water vapor permeability test and ultraviolet-visible spectrum were performed to evaluate the influence of different MOF-199 contents on properties of the composite films. With the increase of MOF-199 concentration, the water vapor permeability of the composite films increased to 1.186×10–13 g•cm/(m2•s•Pa) and then decreased. The tensile strength decreased and the transmittance of the films slightly decreased to 91%, and the maximum elongation at break of the films was kept in the range of 2.1%-2.5%. The incorporation of MOF-199 enhanced the UV absorption property of PLA. Compared with the pure PLA film, the UV absorbance at 210 nm was improved by almost 1.6 times when the amount of MOF-199 was reached to 5.0%. Therefore, the addition of MOF-199 can improve the UV shielding property and water vapor permeability of the prepared MOF-199/PLA composite films. It is proposed that the prepared composite films may have the potential applications in anti-ultraviolet or modified atmosphere packaging.