Packaging adhesive film for photovoltaic module, and preparation method of packaging adhesive film

The invention discloses a packaging adhesive film for a photovoltaic module, and a preparation method thereof the packaging adhesive film. The packaging adhesive film for the photovoltaic module at least comprises two adhesive film layers, wherein the adhesive film layer with the highest reflectivity in all the adhesive film layers is arranged close to a battery sheet, and the reflectivity of theadhesive film layer with the highest reflectivity to light within a wavelength range of 400 nm-1100 nm is larger than or equal to 90%. The packaging adhesive film for the photovoltaic module is prepared by the following method: respectively and uniformly mixing raw materials of each layer of the packaging adhesive film for the photovoltaic module, adding the raw materials into different extruders,injecting the raw materials into the same die head, extruding by a T die head, rolling, and carrying out pre-cross-linking. The photovoltaic packaging adhesive film has a multilayer structure, the problems of low reflection e