Abstract: In order to improve the anti-reflection ability of the optical surface of infrared materials, an anti-reflection super-surface with a double-cycle nested structure was designed. By analyzing the variation of the dielectric constant around the two-cycle nested structure, the reflection efficiency of the double-cycle nested structure was obtained by simulation. The difference between the anti-reflection characteristics of this nested structure and the surface of a single structure was analyzed when the micro structure changed. By changing the surface duty ratio of the nested structure, the diameter ratio of the top and bottom ends, and the aspect ratio simulation, the anti-reflection characteristics of the double-period nested microstructure surface were analyzed, and the double-cycle nesting was finally optimized. The structure could effectively improve the anti-reflection effect in the ultra-wide wavelength range of 2.4-12 m, the reflectance was below 3.5%, and the average reflectance was less than 1% in the practical band range of mid-long infrared wave. The structure effectively protects the micro-structure from damage, realizes the superposition of the anti-reflection characteristics of the single structure, further reduces the reflectivity of the surface of the component, and can be applied as a novel anti-reflection surface in the infrared window.