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Abstract Perovskites have attracted substantial attention on account of their excellent physical properties and simple preparation process. Here we demonstrated an improved photodetector based on solution-processing organic-inorganic hybrid perovskite CH3NH3PbI3−x Cl x layer decorated with CsPbBr3 perovskite quantum dots. The CH3NH3PbI3−x Cl x -CsPbBr3 photodetector was operated in a visible light region, which appeared high responsivity (R = 0.39 A/W), detectivity (D* = 5.43 × 109 Jones), carrier mobility (μ p = 172 cm2 V−1 s−1 and μ n = 216 cm2 V−1 s−1), and fast response (rise time 121 μs and fall time 107 μs). The CH3NH3PbI3−x Cl x -CsPbBr3 heterostructure is anticipated to find comprehensive applications in future high-performance photoelectronic devices.