Photocatalytic technology can convert solar energy into chemical energy under mild reaction conditions and promote the degradation of organic pollutants. As a new type of non⁃metal semiconducting polymer, graphite phase carbonitride has unique electronic structure and good chemical stability. In recent years, it has received extensive attention in the field of photocatalysis, but graphite phase carbonitride itself has some shortcomings. However, graphite⁃phase carbon nitride itself has some shortcomings, for example, the forbidden band width is 2.7 eV, which can absorb only blue⁃violet light of less than 475 nm in sunlight, photo⁃generated carriers are easy to recombine, quantum efficiency is low, and specific surface area is small, which needs to be modified to improve photocatalytic performance. In this paper, the research progress of graphite⁃phase carbon nitride in structure optimization, precious metal deposition, semiconductor composite, element doping, dye sensitization, carbon composite and its application prospect in the field of environmental pollution purification are reviewed.