Abstract: Noble-metal, as co-catalysts, can improve the photocatalytic hydrogen production performance of graphitic carbon nitride (g-C₃N₄). It has been paid extensive attention, however, due to the non-renewability and high expense of noble-metal, "less noble-metal, better performance" is always the goal. To achieve this goal, composite CN with different Pt loadings (Pt/CN) was successfully prepared by photoreduction deposition and used for photocatalytic hydrogen production. The results show that Pt/CN with different Pt loadings can improved photocatalytic hydrogen production performance than CN. It is found that Pt/CN loaded with 0.5wt%Pt have the best photocatalytic hydrogen production activity, with a hydrogen production rate of 409.2 μmol/g, which is 23 times higher than that of CN (17.8 μmol/g). At the same time, it is confirmed that a Schottky barrier is formed between Pt and CN, which makes the electrons of the conduction band migrate rapidly to Pt, which reduces the electron-hole recombination rate of CN. Moreover, Pt is used as the active site of photocatalytic water splitting, which promotes the rapid adsorption of most of the hydrogen protons in the water to the Pt site, and the electrons are reduced to hydrogen, realizing efficient photocatalytic hydrogen production.