A metal-organic framework Ag/ZIF-67 was successfully synthesized and characterized by several methods including X-ray powder diffraction (PXRD), Fourier transform infrared (FT-IR), Scanning electron microscopy (SEM), and Thermogravimetric analysis (TGA). The results showed that Ag/ZIF-67 had a polyhedron structure was similar with ZIF-67 and 5.1% of Ag nanoparticles was loaded into its structure. The catalytic activity of Ag/ZIF-67 was then investigated into methyl orange (MO) minerization process in presence of H2O2. High efficiency was obtained with over 99% when using H2O2 concentration 0,08 mol.L-1, methyl orange concentration 10 mg.L-1, Ag/ZIF-67 concentration 200 mg.L-1 at 30oC, pH 7 in 180 min. The solid and could be recycled and reused without a significant degradation in catalytic activity with the efficiency is over 90% after 3 times