Abstract: Exploring green development and solving the energy crisis has become a trend of commercial development in recent years. Metal halide perovskites have attracted great attentions due to their unique photocatalytic properties. Among them, CsPbBr₃ perovskite has high photocatalytic activity and excellent stability, and has developed rapidly in photocatalytic CO₂ reduction. Under the trend of energy development, reducing carbon emissions and catalytic reduction of CO₂ as fuels are research hotspots and main approaches. However, the poor CO₂ adsorption capacity, severe charge recombination, and low charge efficiency of pure CsPbBr₃ seriously hinder the commercialization of perovskite photocatalysis. In order to solve a series of problems in photocatalysis of pure CsPbBr₃ materials, surface modification the of CsPbBr₃ perovskite or construct on of multicomponent composites is currently the most economical and promising solution. In this review, we systematically review the latest research on photocatalytic CO₂ reduction of CsPbBr₃ perovskites and their composites, discuss the photocatalytic reaction mechanism of CsPbBr₃ perovskites, and then propose obstacles to development. Finally, we expect this review to provide new exploration directions for building more stable, efficient and sustainable photocatalysts for CO₂ emission reduction.