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Design and fabrication of highly active photocatalytic materials under visible light irradiation are one of hotspots in the field of photocatalysis.In this paper, mesoporous AgInO2 has been synthesized by sol-gel method.X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption and ultraviolet-visible (UV-vis) analysis technologies are used to study the effects of preparation condition on the microstructure of the AgInO2.The photocatalytic performances of samples are evaluated using the formaldehy as target objective.The results demonstrate that the mesoporous AgInO2 is a delafossite structure with the uniform size about 200-500 nm and nitrogen adsorption-desorption type Ⅳ isotherms, the absorption edge of AgInO2 lies between 500nm and 600 nm in the visible light scope.As-synthesized AgInO2 exhibited remarkably high photocatalytic activity of 93.1% in decomposing formaldehyde under visible light irradiation for 90 min.These results provide a basic experimental process for preparation novel photocatalyst of AgInO2, which will possess a broad prospect in terms of the applications in improving indoor air quality.