The invention relates to the technical field of anti-counterfeiting, and discloses an anti-counterfeiting rubber cap based on a micro-nano optical structure and a preparation method thereof.The anti-counterfeiting rubber cap comprises an anti-counterfeiting rubber cap body, a plurality of bright lines are arranged on the outer side of the anti-counterfeiting rubber cap body, dark lines are arranged on the anti-counterfeiting rubber cap body located between every two adjacent bright lines, and a code spraying area is further arranged on the outer side of the anti-counterfeiting rubber cap body; a plurality of separation lines are arranged at the top of the anti-fake rubber cap, an anti-fake
chip is fixedly connected to the center of the top of the anti-fake rubber cap, and a plurality of
verification points are arranged at the positions, close to the separation lines, of the top of the anti-fake rubber cap. Multiple anti-counterfeiting structures such as bright fringes, dark fringes, a code spraying area and an anti-counterfeiting
chip are integrated, a multi-dimensional anti-counterfeiting
system is formed, the
imitation difficulty is greatly improved, a multi-layer interference optical variable structure of the bright fringes presents specific color value changes along with the
visual angle, and the identification degree is high; due to the design of the micro-
nano grating with dark fringes, exclusive patterns with high
diffraction efficiency can be generated through
laser irradiation, and the anti-counterfeiting reliability is enhanced.