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In recent years, all inorganic bismuth lead-halide perovskite nanocrystals [CsPbX3 (X = Cl, Br, I)] have received extensive attention due to their high performance in fluorescence quantum yield, narrow emission spectrum, and adjustable emission range. However, the disadvantages of high cost and poor stability have greatly limited the development prospects of the material. Here, in order to develop a perovskite quantum dot lasing cavity with high chemical stability, high quality factor and low fabrication cost, we have successfully fabricated a 3D random cavity device based on porous silicon/TiO2 nanowires. A TiO2 nanowire is grown on the porous silicon to form a 3D resonant cavity, and a perovskite quantum dot is spin-coated on the surface of the 3D resonant cavity to form a novel 3D complex film. The novel structure enhances the chemical stability and lasing quality factor of the resonant cavity while the fluorescence generated by the large quantum dots in the spatial interference structure constitutes the feedback loop, which will provide favorable support for the development of information optics. A 3D random cavity device has been successfully fabricated based on porous Si/TiO2 nanowires. TiO2 nanowires were grown on porous Si to form a 3D resonant cavity. A perovskite quantum dot is spin-coated onto the surface of the 3D resonant cavity to form a distinguished 3D complex film, which provides favorable support to the development of information optics. [ABSTRACT FROM AUTHOR]