In this study, the micro-nano composite structures having multiple morphologies and periods were fabricated via conventional ultraviolet photolithography combined with two-beam laser interference lithography and two-step exposure via two-beam laser interference lithography. The micro-nano composite structure could overcome the shortages imposed by conventional laser photolithography, which yields the microstructures with single morphology and period. By optimizing the experimental parameters, the micro-nano composite structures having different nano-gratings, such as micro-strip gratings, rectangular lattices, circular lattices, and hexagonal lattices, were fabricated. By incorporating the micro-nano composite grating in glass/Ag film/CH3NH3PbI3, the absorption of CH3NH3PbI3 is enhanced in the visible range. This enhancement is mainly attributed to the coaction of light scattering of micro-grating and electric field enhancement of surface plasmon polaritons at the Ag film/CH3NH3PbI3 interface.