Automobile exhaust gas treatment devices generally use precious metals platinum and ruthenium as catalysts, but their cost is relatively high. Using nano-copper powder to replace precious metals as the catalyst in the exhaust gas treatment device not only has the catalytic effect significantly improved, but also the cost can be well controlled. In recent years, in the dehydrogenation and hydrogenation of high molecular polymers in the metallurgy and petrochemical industries, and the polymerization of acetylene, nano-copper powder has achieved good promotion and application effects as a high-efficiency catalyst.