The invention relates to a zinc-doped tungsten trioxide preparation method which includes the steps: dissolving mixture of triblock polymers P123 and polyvinylpyrrolidone (PVP) into deionized water in a water-bath heating and stirring manner, adding HCl solution for acidification, performing aging for a certain time, and adding Na2WO4 solution into mixed solution of the P123 and the PVP drop by drop in a stirring manner to form yellow tungsten acid precipitation; mixing a certain of zinc salt, deionized water and PVP to stir and dissolve, adding alkali liquor, and enabling zinc ions to completely precipitate to obtain white zinc hydroxide precipitation; sufficiently mixing zinc hydroxide and tungstic acid and calcining mixture in a muffle furnace at a certain temperature to obtain zinc-doped tungsten trioxide products.