Strong photoresponse, efficient charge separation, and high surface activity are three important requirements for an ideal photocatalyst, while few photocatalysts can fully meet these requirements. Herein, we report such a photocatalyst based on lead-free halide perovskite hollow nanospheres (H-Cs₃Sb₂Br₉) by a facile antisolvent-assisted method. The hollow structure of H-Cs₃Sb₂Br₉ improves the light-harvesting performance; The formation of surface shallow trap states contributes to promoting the excited-carrier separation; The ligand-free termination surface of H-Cs₃Sb₂Br₉ facilitates the exposure of Br vacancies and active sites, thus strengthens the CO₂ adsorption and accelerates surface reactivity dynamics. As a result, with a dinuclear Co(II) complex as the co-catalyst, H-Cs₃Sb₂Br₉ exhibits a record-high photocatalytic activity for CO₂ reduction, with a CO yield of 15,010.4 ± 550.4 μmol g⁻¹ after 8 h of illumination under simulated solar light (100 mW cm⁻²). This research presents a new way to develop cost-effective photocatalysts for CO₂ reduction.