Low-cost and effective cocatalyst Ni₂O₃ was loaded on SrTiO₃ (STO) via a simple one-step hydrothermal method. The Ni₂O₃ / SrTiO₃ ( m ) photocatalysts were systematically characterized and applied to visible-light-driven CO₂ reduction to investigate their photocatalytic activity. The series of the Ni₂O₃-modified SrTiO₃ photocatalysts presented an improved photocatalytic activity and stability. Here, the N_5.4STO ( m ) catalyst showed the best photocatalytic activity, with CO and CH₄ yielding up to 11.57 and 1.51 μmol / g, respectively, under visible-light irradiation of 3 h, which were 3.15 and 14.84 times higher than that of pure STO(m), respectively. Based on the characterization and experimental results, the enhanced photocatalytic activity might be attributed to the following reasons: (1) Ni₂O₃ well dispersed on SrTiO₃ served as CO₂ attachment sites; (2) the modification of Ni₂O₃ could red shift the absorption edge and broaden the visible-light response ability; and (3) Ni₂O₃ nanoparticles act as electron traps to capture photogenerated electrons, effectively blocking the recombination of electron–hole pairs. The work offers important insights into the design of non-noble metal oxide cocatalyst modified photocatalysts for electron capture and photoreduction.