The work aims to study the photodegradation of methyl orange by the blended photocatalyst (SiO2 aerogels/nano-TiO2 composite), with the methyl orange used to simulate the printing wastewater. SiO2 aerogels were prepared in the sol-gel method. Then, the blended photocatalyst was prepared in the blending method with the addition of nano-TiO2. The samples were characterized by SEM, X-ray diffractometer and FT-IR analysis technology. The photocatalytic activity was observed through the degradation of methyl orange with the blended photocatalyst. When the mass ratio of nano-TiO2 and SiO2 aerogels was 1∶4, the mass concentration of catalyst was 0.2 g/L, the initial mass concentration of methyl orange was 10 mg/L and the pH was 4, the degradation rate of methyl orange was the best. The blended photocatalyst is used to degrade the methyl orange. Due to its high catalytic efficiency, the degradation rate can reach as high as 99.85%.