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The three metal composite catalyst Cu/Mn/La/MCM-41 molecular sieve is synthesized by hydrothermal synthesis method and impregnation method. The morphology and structure of Cu/Mn/La/MCM-41 molecular sieve samples are studied by means of XRD, SEM, BET and FT-IR. Cu/Mn/La/MCM-41 molecular sieve is used as catalyst to degrade the reactive black 5 dye wastewater. The catalytic performance of the catalytic degradation of the reactive black 5 dye wastewater is studied and its apparent kinetic equation is obtained. Results show that compared with the material containing a single metal, Cu, Mn, La load can improve the activity of the catalyst. When the crystallization temperature is 120 ℃, Cu load is 20%, the molar ratio of Cu/Mn/La is 15∶5∶2, the surface area and morphology are larger and more regular. Decolorization rate of reactive black 5 after 120 min can reach 95.6%. Cu/Mn/La/MCM-41 molecular sieve catalytic degradation of reactive black 5 dye waste water dynamics is in line with the pseudo first-order kinetics curves. [ABSTRACT FROM AUTHOR]