In this present work, the photodegradation ability of TiO₂ mesoporous beads having a higher surface area and better light scattering effect than commercial P25 was further improved. A novel plasmonic nanocomposite photocatalyst Ag/MoS₂ nanodots/TiO₂ mesoporous beads was developed in order to overcome the inactivity of TiO₂ under visible light and the high recombination rate of photogenerated electron-hole pairs. TiO₂ mesoporous beads were first synthesized through sol-gel process followed by hydrothermal method. Then, Ag/MoS₂ nanodots were deposited onto the TiO₂ mesoporous beads through facile liquid ultrasonic mixing and chemical reduction method. Nanocomposite photocatalysts having different ratios of Ag, MoS₂ nanodots, and TiO₂ mesoporous beads were synthesized and investigated. Their photocatalytic activities were then determined through the photodegradation of a methylene blue solution.