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A series of stable and color-tunable MAPbBr_3−xCl_x quantum dot membranes were fabricated via a cost-efficient high-throughput technology. MAPbBr_3−xCl_x quantum dots grown in-situ in polyvinylidene fluoride electrospun nanofibers exhibit extraordinary stability. As polyvinylidene fluoride can prevent the molecular group MA⁺ from aggregating, MAPbBr_3−xCl_x quantum dots are several nanometers and monodisperse in polyvinylidene fluoride fiber. As-prepared MAPbBr_3−xCl_x quantum dot membranes exhibit the variable luminous color by controlling the Cl^− content of MAPbBr_3−xCl_x quantum dots. To improve blue-light emission efficiency, we successfully introduced Ag nanoparticle nanofibers into MAPbBr_1.2Cl_1.8 quantum dot membranes via layer-by-layer electrospinning and obtained ~4.8 folds fluorescence enhancement for one unit. Furthermore, the originality explanation for the fluorescence enhancement of MAPbBr_3−xCl_x quantum dots is proposed based on simulating optical field distribution of the research system.