Metal-organic frameworks (MOFs) semiconductor photocatalytic materials demonstrate significant application potential in the field of marine environmental pollution prevention and bacterial control.However, most monomeric MOFs photocatalytic materials exhibit poor charge transfer efficiency and weak light response, which limits the photocatalytic performance of MOFs.Here, a highly optimized NH2-MIL/ZnIn2S4 organic-inorganic composite photocatalyst was constructed by in-situ growth of nanoflower-like ZnIn2S4 on micron-scale short rod-like indium-based NH2-MIL, utilizing a simple solvothermal method followed by a water bath reaction under lower temperatureModifying the indium-based MIL metal-organic framework to obtain NH2-MIL with amino group significantly reduced the band gap, enhanced the light absorption and enhanced the photo-responsive activity.The micro/nano rod-like NH2-MIL support material enables the uniform dispersion and growth of nanoflower-like ZnIn2S4 on its surface at lower temperature without damaging the framework, forming a homogeneous dual-phase type II heterojunction.The indium-based MIL also acted as a indium resource ensure the close composite growth of ZnIn2S4 on itself, and forming a well matched band gradient, which improves the backward migration of photogenerated electrons and holes, and thus enhances the yields of reactive oxygen species (ROS: ·OH, ·O2-).The high surface area of nanoflower-like ZnIn2S4 increases the contact between the photocatalyst and the medium, allowing photogenerated carriers and the corresponding ROS to fully participate in surface photocatalytic reactions and enabling bacteria to adsorb onto its surface, increasing the concentration of surface bacteria and accelerating the efficiency of the photocatalytic sterilization process.The 40NH2-MIL/ZnIn2S4 photocatalyst exhibits the optimal photocatalytic antibacterial activity (99.9%, 99.8%) against Staphylococcus aureus and Escherichia coli under visible light; and the high photocatalytic degradation activity (99.0%) against methyl orange under visible light, which was 1.1 and 2.8 times those of pure ZnIn2S4 and pure NH2-MIL resp.The environmentally friendly 40NH2-MIL/ZnIn2S4 shows great potential in the field of photocatalytic antibacterial applications under visible light.