Abstract: The optical control characteristics of biomimetic moth-eye structures on the surface and interface of perovskite solar cells（PSCs） were systematically investigated using the Finite Difference Time Domain（FDTD） method and Rigorous Coupled Wave Analysis（RCWA）,with the enhancement mechanisms analyzed through Equivalent Medium Theory（EMT）. The results demonstrate that the introduction of moth-eye structures effectively breaks the interface limitations between materials,resulting in the refractive index to shift from adrupt change to gradient change. As a result,optical waves can pass through the interface between the two materials almost unhindered. With optimized regulation,the optical losses of the surface and interface decrease from the original 3.52% and3.30% to 0.08% and 0.06%,respectively. Consequently,the photoelectric response performance of the cells is significantly enhanced,with an increase in energy conversion efficiency by 14.93% compared to planar cells.