The invention discloses a method for preparing a titanium dioxide super capacitor electrode material. The method comprises preparing tetrabutyl titanate and isopropanol into a mixed solution, adding nitric acid to the mixed solution and stirring the mixed solution to obtain a TiO2 colloidal solution; adding polyoxometallate lithium salt to a nitric acid solution, adding a resultant solution to theTiO2 colloidal solution to form a solution of polyoxometallate lithium salt-TiO2 composite material; irradiating and stirring the solution under ultraviolet light, reducing the solution to heteropolyblue, and then adding graphene oxide solution to form a polyoxometallate lithium salt-TiO2-graphene composite solution; and obtaining the titanium dioxide super capacitor electrode material by washing and drying. The method exerts the ion-conducting properties of the polyoxometallate lithium salt, the conductivity of the graphene, and the large specific surface area of the TiO2 which three fullyenhances the performance of the super capacitor.