The invention discloses a copper drawing oil additive. The additive comprises, by weight, 5-12 parts of a copper passivation agent, 0.1-0.3 parts of a copper passivation pre-filming agent, and 3-8 parts of a copper antioxidant. The copper passivation agent comprises a corrosion inhibitor, organic phosphate, molybdate and hydrogen peroxide. The copper passivation pre-filming agent comprises a complexing agent, a dispersing agent and a film-forming agent. The copper antioxidant comprises sodium benzotriazole and a salt-spray-resistant additive. The copper drawing oil additive is composed of the complex of the long-effect passivation agent, the passivation pre-filming agent, the antioxidant and the like. The additive has the advantages of simple preparation, convenient application, and excellent oxidation resisting effect. The additive does not contain nitrite ions or sexivalent chromium ions. The additive is safe, environment-friendly, time-saving, labor-saving, and material-saving. The additive has good economic and social benefits.