The invention discloses a thin-walled large specification honeycomb ceramic carrier and a preparation method thereof. Raw materials of the carrier comprise kaolin, aluminum oxide, silicon dioxide, talc powder, aluminum titanate micropowder and the like. The preparation method comprises the following steps: mixing kaolin, aluminum oxide, silicon dioxide, talc powder, aluminum titanate micropowder,zirconium phosphate and cerous phosphate, and uniformly stirring the mixture to obtain a mixed material; adding glycerin and hydroxypropyl methyl cellulose into water to obtain an additive solution; mixing the mixed material with the additive solution, uniformly stirring the mixture, and carrying out kneading, ageing and vacuum pugging to obtain a pug; and extruding the pug under pressure by meansof a mold to obtain a cylindrical honeycomb ceramic wet blank, and drying and roasting the cylindrical honeycomb ceramic wet blank to obtain the thin-walled large specification honeycomb ceramic carrier. The disc diameter of the thin-walled large specification honeycomb ceramic carrier provided by the invention can reach 300-350 mm, the pore density can reach 300-400 pore/sq. inch, and the thin-walled large specification honeycomb ceramic carrier meets the demand of treating tail gas of a large discharge diesel vehicle.