The Feasibility of interfacial redox reaction has determinant role in hydrogen evolution during photocatalytic water-splitting process. Here, we report that promoting interfacial oxidation ability of porous graphitic carbon nitride (Pg-C3N4) with defects can effectively improve visible light photocatalytic hydrogen evolution (PHE) activity. Pg-C3N4 with edge site defects was fabricated by constraining growth of g-C3N4 on porous kaolinite-derived template. The Pg-C3N4 with extra electrons of defects caused by enriched basal plane holes exhibits higher electrocatalytic activity for oxidation process in comparison with reduction process. This feature benefits electron-transfer reaction to quench photo-excited holes during photocatalysis process and promote photoelectrons reaction, which was proved by photoluminescence spectra of Pg-C3N4 and g-C3N4 and different PHE activity variation of their heterojunction materials with TiO2. The results show that PHE rate for Pg-C3N4 reaches 1917 umol(-1) g(-1) h(-1), 2.37 times of g-C3N4 under visible light irradiation. This approach of engineering interfacial defects to accelerate hole's oxidation reactions during photocatalytic water-splitting would advance two-dimensional (2D) catalysis for solar fuel production.