It is more and more important to find a novel green energy with the development of industry and consumption of fossil fuel. Hydrogen is a kind of clean and renewable fuel, and using photocatalyst to decompose water to produce hydrogen is an effective way to produce hydrogen. Graphite carbonitride photocatalyst (g-C3N4) as photocatalyst is low-cost and stable, also its size, thickness, structure and morphology is controllable. However, there are two main limitations of g-C3N4 in the field of photocatalysis: 1), the absorb light of g-C3N4 is limited by the wide band gap which caused the photoelectron-hole pairs is insufficient; 2), the recombination of electron and hole is high due to the transportation and separation of photoelectron-hole pair in g-C3N4 is limited. In this paper, the research progress of g-C3N4 in the field of photocatalytic hydrogen production is reviewed, the problem of g-C3N4 as photocatalyst is analyzed, also the improvement methods are summarized. Finally, the future development of g-C3N4 is prospected, the results can be used as a reference for the design and preparation of efficient and stable photocatalytic materials.