CO₂ is the main gas that causes the “greenhouse efect,” and it is also a rich carbon resource. The photocatalytic conversion of CO₂ into fuel not only relieves the pressure brought by the environment pollution, but also is promising way to achieve the carbon cycle and address the problem of energy shortage. It is essential to design efcient photocatalysts for the practical application of photocatalytic CO₂ conversion. Doped graphite carbon nitride (g-C₃N₄) has a reduced bandgap, increased light absorption and efective charge separation and transfer efciency. Recently, its application has been extended to the feld of photocatalytic reduction of CO₂. In this review, we frst discuss the basic principles of photocatalytic reduction of CO₂, then focus on the application of g-C₃N₄ doped with diferent elements in the photocatalytic reduction of CO₂ in recent years, and then summarize diferent doping methods. Finally, challenges and opportunities are presented, and potential solutions are proposed for future research.