The invention relates to universal primer for nonferrous metal. The universal primer is composed of a component A and a component B, the component A is composed of, by weight, 20-30 parts of epoxy resin, 10-18 parts of modified epoxy resin, 7-13 parts of coloring pigment, 15-21 parts of environment-friendly anticorrosion pigment, 6-10 parts of talcum powder, 4-6 parts of precipitated barium sulfate, 1-3 parts of mica powder, 0.5-2 parts of anti-settling agent, 0.1-1 part of adhesion promoter, 0.1-1 part of wetting dispersant, 0.1-1 part of flatting agent and 10-20 parts of mixed solvent, and the component B is composed of amino silane grafted modified amine hardener and a mixed solvent. The universal primer is convenient in construction, quick to dry and easy to polish, is used for the non-treated or lowly-treated surfaces of the nonferrous metal like aluminum alloy, stainless steel and copper alloy, has excellent adhesion performance and high corrosion resistance and is highly matched with a lot of finishing paint. Aiming at difference nonferrous metal substrates, varieties of special paint can be reduced after the universal primer is adopted for construction, so that technical process is optimized, and coating efficiency is improved.