Abstract: Fly ash, as a kind of solid waste, has the advantages of low cost and wide sources, and can be widely used to prepare zeolite as catalyst carrier, realizing its high value utilization and protecting the ecological environment at the same time. The X-type zeolite-TiO_2 composite photocatalyst was prepared from solid waste fly ash and TiO_2 was successfully loaded during the synthesis of zeolite, which saved the preparation cost compared with the loading method after synthesizing zeolite. A 4-factor, 4-level orthogonal test was used to explore the best preparation conditions of the catalyst with the mass ratio of titanium dioxide to fly ash, the mass ratio of fly ash to sodium hydroxide, the mass and volume ratio of fly ash to ultrapure water, and the crystallization time as the influencing factors, and the removal rate of methylene blue as the target function, and the best catalyst was characterized by XRF,XRD,FTIR,and SEM. The experimental results show that the best catalyst performance is achieved when m_1/m_2 is 1.0∶2.9,m_3/m_2 is 1.5∶1.0,the ash-water ratio is 1∶10,and the crystallization time is 24 h(where m_1,m_2,and m_3 are the masses of TiO_2,fly ash, and NaOH,respectively). The methylene blue simulated waste solution with a mass concentration of 10 mg/L is prepared, 0.25 g/L of catalyst under this group of conditions is added, and the reaction is carried out at 30 ℃ for 1 h. The removal rates of methylene blue are 42.47% and 98.15% under the dark and UV irradiation conditions, respectively, indicating that the X-type zeolite-TiO_2 composite photocatalyst synthesized by this method has a good treatment of dye molecules in printing and dyeing wastewater. Moreover, fly ash belongs to thermal power plant waste, and a more ideal catalyst material is prepared under low-cost conditions to realize waste to waste.