The invention provides a high performance polypropylene film and a preparation method thereof. The film comprises a top film, a core film and a lower film. The top film includes 2.0-3.0% of a nano-silica composition and 97.0-98.0% of first polypropylene, the core film includes 0.5-2.0% of a nano-silica composition and 99.5-98.0% of second polypropylene, and the lower film includes 3.5-5.0% of a nano-silica composition and 96.5-95% of third polypropylene, wherein the nano-silica composition includes 50-55% of nano-silica particles and 45-50% a resin modifier. Each layer of the film contains a specific content of nano-silica composition, so that the film has high modulus and elongation at break, low diffusion coefficient and solubility parameter to solvent small molecules, low dynamic friction coefficient, and has good comprehensive properties, thus being suitable for flexible packaging materials.