Two-photon fluorescence emitted by micro/nanostructured perovskites has been widely applied in high-resolution imaging and photoelectric conversion. However ,significantly enhancing the two-photon fluorescence emission intensity is essential for improving the performance of associated devices. Unlike dielectric substrates ,the development of micro/ nanostructures on precious metal films is effective for achieving enhanced linear and nonlinear opticalresponsesowing to plasmon excitation. The results of this study showed thatthe optical response of superlattice structuresgrown on a goldfilm was strongerthan thatofsamplesgrown on a glass substrate. Furthermore ,experimental results showed that the linear photoluminescence intensity increased by approximately100% and the two-photon luminescence intensityincreased significantlybyapproximately16times. Furthermore ,weconfirmed a distinct polarization dependence of the two-photon emission of this superlattice by changing the polarization of the pump light ,and that the polarization angle exhibited quadruple symmetry within the range of 0°~ 360°. These results indicated that growing a CsPbBr3 nanocrystalline superlattice on a gold film is an effective strategy to achieve enhanced two-photon emission intensities. This study provides new possibilities and optimization ideas for constructing high- performance micro/nano-nonlinear photonic devices.