A photocatalytic method of colored discharge printing for producing colorized patterns on textiles includes: textiles are over dyed with illuminant dyes and ground shade dyes respectively; then the patterned printing plates with hollow-outs decorative patterns are manufactured, and the photocatalyst is applied on the over-dyeing textiles through the hollow-outs; finally, with the photocatalytic method of colored discharge printing, the ground shade dyes are localized discolored, while the illuminant dyes are left on the substrates, having an effect of colorized patterns on textiles. The method has the characteristics of simple process and apparatuses, short processing, easy controlling and wide adaptability, along with eliminations of the needs for printing pastes and expensive printing apparatuses, so as the complicated process in the conventional printing method.