arrier and multifunctional material for transferring electrons and holes. Semiconductor/graphene composite photocatalysts have been a hot topic of research in recent years. Numerous studies have been reported [18], and some reviews have also emerged. For example, Yu et al. [19] summarized the methods used to prepare GR‐based semiconductor photocatalysts and their use in environmental and energy applications in detail, while Xu et al. [20] reviewed the present applications of graphene‐based photocatalysts (especially the photocatalytic selective transformation of organic substances) and their prospects for future development. To comprehensively understand the latest progress of semiconductor/GR composite photocatalysts, here we review the methods used to prepare these photocatalysts, and their application in decomposing organic pollutants, photocatalytic splitting of water to produce H2, photocatalytic reduction of CO2 to produce organic fuels, and photocatalytic sterilization. We summarize the photocatalytic mechanisms of semiconductor/Gr composite photocatalysts, as well as their current research and prospects for development. The purpose of this review is to expose