The work aims to study the properties of nano-silver composite films prepared by melt blending. Nanosi lver-polyethylene composite packaging films with different additives were prepared by melt blending and film blowing. Particle size of nanosilver powder and silver in nanosilver-polyethylene composite films was characterized by scanning electron microscope and the chemical bonds within the composite films were characterized by Fourier transform infrared spectrometer. The effects on the color, light transmittance, oxygen permeability and water vapor permeability of the films were examined after the nanosilver-polyethylene composites were prepared by melt blending. The results showed that nano-silver powder and silver in the composite films were of different particle sizes, and the addition of nano-silver resulted in no obviously new chemical bonds. As a result, the light transmittance of composite films was reduced by 3.9%~12.2%, the oxygen permeability was improved by 6.56~117.17 cm3/(m2•d•(0.1 MPa)), and the water vapor permeability was improved by 0.038~1.791 g/(m2•d). The light transmittance of nanosilver-polyethlene composite film prepared by melt blending is decreased, the oxygen permeability and water vapor permeability are improved, and no obviously new chemical bonds are formed.