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Herein, cobalt (Co)‐based metal–organic zeolitic imidazole frameworks (ZIF‐67) coupled with g‐C₃N₄ nanosheets synthesized via a simple microwave irradiation method. SEM, TEM and HR‐TEM results showed that ZIF‐67 were uniformly dispersed on g‐C₃N₄ surfaces and had a rhombic dodecahedron shape. The photocatalytic properties of g‐C₃N₄/ZIF‐67 nanocomposite were evaluated by photocatalytic dye degradation of crystal violet (CV), 4‐chlorophenol (4‐CP) and photocatalytic hydrogen (H₂) production. In presence of visible light illumination, the photocatalytic dye results showed that 95% CV degradation and 53% 4‐CP degradation within 80 min. The H₂ production of the g‐C₃N₄/ZIF‐67 composite was 2084 μmol g⁻¹, which is 3.84 folds greater than that of bare g‐C₃N₄ (541 μmol g⁻¹).