The article reviews the progress and challenges in the photocatalytic reduction of CO₂ using g-C₃N₄-based photocatalysts in the context of carbon neutrality. Global warming, driven by the continuous emission of greenhouse gases, poses significant threats to industrial and agricultural productions and human life. Carbon neutrality, a key measure to mitigate the greenhouse effect, emphasizes the importance of reducing carbon emissions and promoting the carbon cycle. g-C₃N₄, due to its simple preparation process, high stability, suitable energy band position, and excellent photocatalytic performance, has gained significant attention. The review highlights the current methods and technical means to enhance the efficiency of g-C₃N₄ in photocatalytic CO₂ reduction, addressing issues such as low utilization efficiency and fast electron-hole recombination. Future research directions are proposed to overcome these challenges and improve the practical applications of g-C₃N₄-based photocatalysts. The article also discusses the significance and necessity of carbon neutrality, emphasizing the need for stringent emission limits and the importance of achieving peak emissions to meet the goals set by the Paris Agreement.The article reviews the progress and challenges in the photocatalytic reduction of CO₂ using g-C₃N₄-based photocatalysts in the context of carbon neutrality. Global warming, driven by the continuous emission of greenhouse gases, poses significant threats to industrial and agricultural productions and human life. Carbon neutrality, a key measure to mitigate the greenhouse effect, emphasizes the importance of reducing carbon emissions and promoting the carbon cycle. g-C₃N₄, due to its simple preparation process, high stability, suitable energy band position, and excellent photocatalytic performance, has gained significant attention. The review highlights the current methods and technical means to enhance the efficiency of g-C₃N₄ in photocatalytic CO₂ reduction, addressing issues such as low utilization efficiency and fast electron-hole recombination. Future research directions are proposed to overcome these challenges and improve the practical applications of g-C₃N₄-based photocatalysts. The article also discusses the significance and necessity of carbon neutrality, emphasizing the need for stringent emission limits and the importance of achieving peak emissions to meet the goals set by the Paris Agreement.