Producing chemical fuels from sunlight enables a sustainable way for energy consumption. Among various solar fuel generation approaches, photocatalytic CO₂ reduction has the advantages of simple structure, mild reaction condition, directly reducing carbon emissions, etc. However, most of the current photocatalytic systems can only absorb the UV-visible spectrum of solar light. Therefore, finding a way to utilize infrared light in the photocatalytic system has attracted more and more attention. Here, a Z-scheme In₂S₃-TiO₂ was constructed for CO₂ reduction under concentrated natural sunlight. The infrared light was used to create a high-temperature environment for photocatalytic reactions. The evolution rates of H₂, CO, and C₂H₅OH reached 262.2, 73.9, and 27.56 µmol·h^-1·g^-1, respectively, with an overall solar to fuels efficiency of 0.002%. This work provides a composite photocatalyst towards the utilization of full solar light spectrum, and could promote the research on photocatalytic CO₂ reduction.