The effective separation ability of photogenic support plays a crucial role in catalytic hydrogen production. The establishment of heterojunction structure is an effective means to overcome the limited carrier separation ability of some single catalysts. In this paper, Cu, Graphdiyne (GDY) and NiCoMoO4 were successfully coupled to construct a composite photocatalyst NCY-15%. The addition of sheet GDY effectively prevented the aggregation of NiCoMoO4, increased the number of active sites, and enhanced the light-trapping ability of the composite catalyst. The synergistic interaction of S-scheme heterojunction and Ohmic junction heterojunctions between Cu, GDY and NiCoMoO4 provides a unique transfer pathway for electrons, facilitating the rapid separation of photogenerated carriers and accelerating electron transfer, while retaining electrons with strong reducing capacity to participate in hydrogen production, thereby increasing the hydrogen evolution rate. This provides a new way for the development of GDY based photocatalysts.