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A series of composite photocatalysts were prepared by using graphene oxide (GO) and TiO₂ hydrogel. The composite photocatalyst was characterized through SEM, XRD and Raman spectroscopy, the decolorization effect of pure TiO₂ and composite photocatalyst on methylene blue (MB) dye wastewater under different experimental conditions was studied. The results show that TiO₂ in composite photocatalyst is mainly anatase phase and its photocatalytic activity is better than pure TiO₂. When the addition of GO reaches 15%(mass fraction), the photocatalytic activity is the highest. When 250mg composite photocatalyst is added to 30mL synthetic wastewater with a concentration of 10mg/L and an initial pH value of about 8, the decolorization rate can reach 93.1% after 2.5 hours, and the composite photocatalyst has visible photocatalytic activity. It is presumed that the photogenerated charges of GO/TiO₂ composite photocatalyst may directly destroy the luminescent groups in the MB molecule,and no other new luminescent groups are generated during the treatment.