The invention discloses a micro-arc oxidation technology applied to vibrating membranes of metal trumpets. The micro-arc oxidation technology comprises the following technology steps: placing an aluminum workpiece and an anode material in a prepared electrolyte, enabling the voltage to rapidly raise to 300V, and keeping the voltage of 300V for 5-10 seconds; enabling the anodic oxidation voltage to raise to 450V, and performing electrolyzation for 5-10 minutes; placing the aluminum workpiece in a K2OnSiO2 water solution of which the concentration is 250 g / L, and oxidizing the aluminum workpiece with the anodic oxidation current being1A / dm2 for 5 minutes; then, placing the oxidized aluminum workpiece in a Na3P2O7 water solution of which the concentration is 70g / L, and oxidizing the aluminum workpiece with an anodic current being 1A / dm2 for 15 minutes. After the micro-arc oxidation technology disclosed by the invention is adopted to perform micro-arc oxidation on the vibrating membrane of a metal trumpet, a ceramic membrane of which the property is similar to that of sintered carbides can be formed on the surface of the vibrating membrane, so that the surface of the vibrating membrane has the properties of high hardness, high-temperature resistance, corrosion resistance, good insulation, wear resistance and the like; the micro-arc oxidation technology disclosed by the invention has the advantages of simple process, convenience in operation and control, low cost, and the like.