Dye-sensitized solar cells (DSSCs) are expected to be a clean energy source due to their low cost and high conversion efficiency. Among DSSCs, DSSCs using hollow Titanium dioxide (TiO2) in the scattering layer are known to be a promising improvement method because of their improved light utilization efficiency and dye adsorption. Therefore, H-mpTiO2/CQD was prepared in this study. The photocatalytic activities of the composite photocatalysts were evaluated using methylene blue. The crystal structure was analyzed using XRD, and the microstructure was analyzed using scanning electron microscope (SEM). The results showed excellent adsorption and decomposition performance. This is due to the Z-scheme structure constructed by supporting the CQD and TiO2. The specific surface area was improved by incorporating CQDs into mesoporous TiO2, and in addition, the recombination rate of the generated electrons and holes was reduced by providing a migration path for the excited electron pairs. The hollowing of the material exposed the inner and outer portions, which may have improved the photocatalytic activity by further improving the specific surface area. These results suggest that H-mpTiO2/CQD is a promising scattering layer for dye-sensitized solar cells.