Abstract: W,N-TiO₂/ SiO₂/ Fe₃O₄ magnetic photocatalyst was prepared by low temperature sol-gel method,and its adsorption and catalytic degradation of methyl orange in organic wastewater respectively during the dark reaction and photoreaction was studied. Through degradation of methyl orange with different concentrations by the W,N-TiO₂/ SiO₂/ Fe₃O₄ magnetic photocatalyst,the degradation was confirmed to be a first-order reaction meeting the Langmiur-Hinshelwood (L-H) kinetics model with reaction rate constant k= 2.18 mg/(L·min) and apparent adsorption equilibrium constant K = 0.075 (L/mg). The half-life of reaction was found to lengthen with the increase in the initial concentration of methyl orange.