The invention discloses a technology for preparing 
organic fuel through directly converting 
carbon dioxide by using 
sunlight and a photothermal catalyst. 
Sunlight is utilized to supply light and heat for the synthesis and catalytic process of the photothermal catalyst, and the photothermal catalyst can simultaneously absorb and utilize 
ultraviolet light, visible light and 
infrared light parts in 
sunlight, so that a phtothermal catalytic reaction is induced to prepare the 
organic fuel through reducing 
carbon dioxide by using 
hydrogen. The photothermal catalyst comprises the following components: an 
active component which is a 2-30 nano-scale non-stoichiometric 
oxide belonging to a VIII-family element in a transition family and a 
carrier material which is an 
oxide or carbon material with the specific surface area of 30-1000cm<2> / g, alkaline resistance, 
high heat conductivity or photocatalytic activity. A 
steeping and in-situ 
sintering method or photodepositing and in-situ 
sintering method is used as a synthesis method so that the 
energy consumption is low, and the photothermal catalyst has 
high activity and long service life by using a solar-assisted in-situ 
sintering technology. The technology for preparing 
organic fuel through directly converting 
carbon dioxide by using 
sunlight and the photothermal catalyst is low in 
energy consumption in the catalytic process, high in organic fuel production efficiency and stable in catalyst activity.