Photo-thermal synergistic catalytic is an excellent application mean to solve the key scientific problems of high energy consumption and high activation energy in the traditional thermocatalytic process. The CeO₂/Pd/Carbon photothermal catalysts （denoted as PCC） were synthesized by liquid-phase reduction， impregnation and amino acid induction methods using carbon nanospheres as the heat source， Pd nanoparticles as the active site and the semiconductor material CeO₂ as the photocatalyst and oxygen activation site， and the photothermal synergistic catalytic reaction system was constructed. The catalytic reaction system has full-spectrum absorption and excellent photothermal conversion ability， which could convert light energy into thermal energy to achieve in situ heating of the active site and increase the active site temperature and reaction potential energy； meanwhile， it has superior charge-hole separation efficiency， which could enhance the activation of oxygen molecules， reduce the reaction activation energy and promote the reaction. Under the light intensity of 400 mW·cm^-2， its complete conversion of CO can be achieved at furnace temperature of 72 ℃. The work could provide some reference and ideas for the design of photothermal catalysts for different systems.

photothermal catalysis;carbon monoxide oxidation;photothermal synergy;oxygen activation