The invention relates to a preparation method of a fullerene-doped titanium dioxide visible-light-driven photocatalyst. The method comprises the following steps: in the presence of nitrogen, reacting fullerene C60, p-carboxy benzaldehyde and sarcosine in an organic solvent for 8-10h at the temperature being 100-115 DEG C, and performing separation and purification to obtain carboxyl group functionalized fullerene derivatives; and dispersing the carboxyl group functionalized fullerene derivatives and titanium dioxide in absolute ethyl alcohol, performing ultrasonic dispersing, performing rotary evaporation, and performing vacuum drying to obtain the fullerene-doped titanium dioxide visible-light-driven photocatalyst. The method disclosed by the invention is simple, the prepared photocatalyst has the good dye absorption capacity and visible-light catalytic activity; under the illumination of a xenon lamp, the prepared photocatalyst can be used for highly efficiently degrading rhodamine dye and has an important application prospect in waste water decoloration treatment in printing and dyeing industry.