Dynamic amplifying optical film of flat Fresnel lens array

The invention discloses a dynamic amplifying optical film of a flat Fresnel lens array. The optical film comprises a substrate layer, a plurality of Fresnel lens array layers positioned above the substrate layer, and a plurality of micro-pattern layers positioned below the substrate, wherein each Fresnel lens array layer consists of a plurality of Fresnel lenses which are arranged in an array; the distance between the Fresnel lens array layers and the micro-pattern layers is the focus distance of each Fresnel lens. According to the dynamic amplifying optical film disclosed by the invention, patterns in the micro-pattern layers are amplified and reproduced because of the imaging effect of the Fresnel lenses; the reproduced and amplified image has a dynamic three-dimensional effect.