The invention relates to a preparation method of a carrier silica gel. The carrier silica gel adopts silicate and an inorganic acid as raw materials. The preparation method comprises the following steps: a silicate solution is used as a base liquid, and an inorganic acid solution is added to adjust the pH value of the solution; an ethanol-water solution of alkali metal carbonate is added; two metal nitrates are added; an organic alcohol-water solution of the inorganic acid is added to adjust the pH value of the obtained solution; and the silica gel product is obtained after a hydrothermal reaction, acidification, washing, drying and activation. The method can greatly improve the specific surface area of the silica gel without affecting the pore volume of the silica gel, so the basic physical properties of the carrier silica gel are improved; and the method has the advantages of simplicity in preparation operation, good repeatability and low energy consumption, and provides a technical support for industrial device production.