The invention discloses a preparation method of photocatalyst environment-friendly fabric and particularly relates to the field of curtain manufacturing. The photocatalyst environment-friendly fabric comprises cotton spun cloth, a binder, active dye, plant oil, pickling liquid, soaping powder, finishing liquid, a photocatalyst and a penetrant, the binder, the active dye, the plant oil, the pickling liquid, the soaping powder, the finishing liquid, the photocatalyst and the penetrant are combined to the cotton spun cloth physically and chemically, the physical mode refers to combining the active dye with the cotton spun cloth through the binder, and the chemical mode refers to combining the photocatalyst with the cotton spun cloth through the penetrant. Through photocatalyst loading, processing is performed by mainly using the photocatalyst, the processing technique is slightly different from conventional processing techniques, a conventional overflow cylinder can use the technology, and a manufacturer does not need to additionally purchase any equipment, so that resources are saved, and production cost is lowered; nano titanium dioxide is adopted, has certain antibacterial and mildewproof effects under illumination and can remove formaldehyde under light excitation, so that effects of purifying air and beautifying environment are realized.