Abstract: In this paper, sodium glutamate was used as a structural regulator to prepare BiOI by low temperature liquid phase method, and its structure and photocatalytic performance were preliminarily studied. The XRD pattern shows that the synthesized material is BiOI with higher crystallinity. After adding sodium glutamate, BiOI has a petal-like porous structure, the size of the lamella is about 500 nm, the thickness of the lamella is about 30~40 nm, and the specific surface area increases from 6.462 m²/g to 14.422 m²/g, which further improve the photocatalytic performance of BiOI. After 2 hours of white LED lighting, the photocatalytic degradation rate of methyl orange reached 94.7%. The mechanism research experiment proved that h⁺ and ·O^2- are the main active species of BiOI photocatalyst for photocatalytic degradation of methyl orange dye.