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In this study, the morphological properties of g-C₃N₄ in g-C₃N₄-Pt photocatalysts were modified by a simple hydrothermal treatment for photocatalytic hydrogen evolution. In addition, the morphological modification effect of g-C₃N₄ on the hydrogen evolution performance was investigated. The long-time hydrothermal treatment clearly changed the morphology of g-C₃N₄ by building extended melem units with more oxygen functional groups at the defect edges of the extended melem units, which was evidenced by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) measurements. The different morphological features of g-C₃N₄ resulted in lower photoluminescence (PL) emission intensity in PL spectra and a smaller semicircle radius in electrochemical impedance spectroscopy (EIS) data. This indicates the more efficient charge separation of the g-C₃N₄-Pt photocatalyst with a modified morphology. Consequently, morphologically modified g-C₃N₄-Pt showed a higher photocatalytic hydrogen evolution rate due to the better charge separation efficiency.