To address the issue of inadequate photocatalytic performance of traditional titanium dioxide (TiO2), this study employs multimetal loading and doping techniques to modify TiO2. By further loading Pt, Ag, and Mn onto 0.1% Cu-doped modified TiO2, modified TiO2 materials with multiple metal loadings and dopings were successfully prepared. Experimental results show that using SN5040 as the dispersant and adding it at a dosage of 1% before loading other metals can significantly enhance the photocatalytic performance of the modified TiO2 materials. Further comparison of the modified TiO2 materials loaded with Pt, Ag, and Mn revealed that the Cu-doped nano-TiO2 catalyst loaded with Pt exhibited the best decolorization effect on MB, reaching 92.5%. This study provides important references and a basis for the modified preparation of TiO2.