Preparation method of composite photocatalytic material for fresh-keeping of fruit and vegetable

The invention discloses a preparation method of a composite photocatalytic material for fresh-keeping of fruits and vegetables and a process thereof, comprising preparation of sol through acidic hydrolysis with titanium ester as a raw material, or preparation of absorption type composite photocatalytic material through ultrasonic dispersion of nano titanium dioxide in water and water heating treatment after adding activated carbon fiber, wherein the titanium dioxide is the main catalyst of the absorption type composite photocatalytic material, and the activated carbon fiber is the carrier and the supporting mass thereof. The prepared material can transform ethylene, ethanol, acetaldehyde and the like generated in breathing of fruits and vegetables in processing plants and refrigerators for the fruits and vegetables, and hydrogen sulfide, ammonia and other common volatile contaminants generated in rotting of the fruits and vegetables into harmless materials through photocatalytic reaction under the ultraviolet