The invention discloses a non-ferrous metal surface treating agent and belongs to the field of metal surface treatment. The non-ferrous metal surface treating agent contains the ingredients in parts by mass: 5-8 parts of sodium polyacrylate, 1-5 parts of sodium pyrophosphate, 0.5-2 parts of carboxymethyl cellulose, 1-3 parts of sodium dodecyl sulfonate, 3-5 parts of acetic acid, 3-8 parts of chitosan, 7-12 parts of alumina, 1-3 parts of triethanolamine and 70-80 parts of deionized water. Through treating the surface of metal by using the non-ferrous metal surface treating agent, the metal can be effectively prevented from oxidation and corrosion, and the surface of the metal can be kept bright; the non-ferrous metal surface treating agent is pollution-free to environment, is degradable, is low in cost and safe in use, and is beneficial to very good popularization.