Abstract: Graphdiyne, as a new two-dimensional carbon allotrope, has shown significant application potential in the field of photocatalytic hydrogen production due to its unique sp-sp² carbon atom arrangement, linear alkyne bond, uniform pore structure and high conjugation characteristics. This paper systematically reviews the preparation methods of GDY, including glaser coupling, hay coupling, eglinton coupling, chemical vapor deposition, interfacial synthesis, template method and mechanochemical synthesis, etc. These methods play a key role in the controlled growth and structural regulation of GDY. Future research into graphitic acetylene preparation includes high-quality monolayer growth, heteroatomic doping, novel characterization techniques, and expanding its applications in areas such as energy conversion. The properties of GDY in photocatalytic hydrogen production, such as enhanced light absorption capacity, optimized photogenerated charge separation efficiency, and inhibition of photogenerated electron-hole pair recombination, are elaborated. In addition, the synergistic effect of GDY with heterostructures constructed from other semiconductor materials in photocatalytic hydrogen production is also investigated, which significantly improves the photocatalytic efficiency by facilitating the efficient separation of photogenerated electrons and holes. At the same time, the combination of GDY with quantum dots and single atom catalysts will develop more efficient photocatalysts.It is pointed out that high quality monolayer growth, heteroatomic doping and new characterization techniques are the focus of future research in the preparation of graphylene. In terms of the application of graphiyne in photocatalytic hydrogen production, optimizing the graphiyne heterogeneous structure, combining graphiyne with quantum dots and single atom catalysts to develop more efficient composite photocatalysts is the direction of future research. The article points out that high-quality monolayer growth, heteroatomic doping, and new characterization techniques in the preparation of graphiyne are the focus of future research. In terms of the application of graphiyne in photocatalytic hydrogen production, the future research direction is to optimize the graphiyne heterostructure to improve the photogenerated charge separation efficiency, and to develop more efficient composite photocatalysts by combining graphiyne with quantum dots and single atom catalysts.