The invention discloses a supported tungsten trioxide hollow sphere, and a preparation method and an application thereof. The method adopts a solvothermal process to in situ grow a tungsten trioxide hollow sphere on a base material, and concretely comprises the following steps: dissolving a tungsten source and a shape control agent in water or an alcohol solvent to prepare a precursor solution, pouring the precursor solution into a hydrothermal kettle internally provided with a base material, and carrying out a hydrothermal reaction to obtain the supported tungsten trioxide hollow sphere, wherein the shape control agent is urea. The method has the advantages of simplicity, good stability and reliability, high efficiency, short flow, convenience, easiness in obtaining, low cost and great promotion values; and the product obtained in the invention has the advantages of good crystallinity, uniform size and good photocatalytic performance, reserves the photocatalytic performance of per unit area of tungsten trioxide with an original morphology, can solve the environmental problems caused by powdery photocatalysts, can be widely used in the pollutant degradation field and other photocatalysis fields, and has great practical significance.