Abstract: Fluvastatin, a commonly used lipid-lowering drug, is often discharged into water bodies with human excreta. Fluvastatin in environmental water bodies is difficult to be degraded by natural light, and long-term accumulation will pose a certain threat to the environment.In this study, bismuth tungstate ( Bi2WO6 ) was used for visible photocatalytic degradation of fluvastatin, to study the morphology structure and photoelectric property change rule of Bi2WO6 prepared with different pH of the hydrothermal reaction precursor solution, and to combine with the analysis of reactive radicals and intermediates to reveal the mechanism of fluvastatin degradation.The results showed that the Bi2WO6 crystal development process was disrupted causing nanosheet stacking when the precursor pH was shifted from acidic to neutral, and the formation of octahedral phases resulted in a decrease in photocatalytic performance when the precursor pH was alkaline, and the optimal precursor pH was 0.5.After four rounds of cycling experiments, the catalyst was still able to maintain relative stability and the degradation rate remained almost unchanged.The results of electrochemical experiments show that Bi2WO6 has the best photogenerated electron-hole separation performance when the precursor solution pH=0.5, which in turn promotes the efficient generation of reactive radicals.The results of free radical experiments showed that h+ played the main oxidative role in the degradation process, with ·OH and ·O2– playing a supplementary role. the mechanism of the degradation of fluvastatin by Bi2WO6 was that h+ was mainly used as the main component, and ·OH and ·O2– were the supplementary components, which jointly attacked the C-C bond of the fluvastatin molecule to form small-molecule cyclic organics, straight-chain organics, and hydroxylated derivatives. organics and hydroxylated derivatives, which are then converted to CO2 and H2O.