The invention discloses a metal oil stain cleaning agent and belongs to the technical field of industrial cleaning. The metal oil stain cleaning agent is characterized by being prepared from the following raw materials comprising, by weight, 12-25 parts of surface active agent, 1-3 parts of chelating agent, 2-5 parts of corrosion inhibitor, 1.2-2.6 parts of antifoaming agent, 2.2-5 parts of sodium silicate, 1.4-5 parts of solubilizer, 3-6 parts of penetrating agent, 2.0-7.2 parts of triethanolamine and the balance water. The metal oil stain cleaning agent has the advantages of being high in cleaning performance, good in corrosion resistance, excellent in stability, convenient to prepare and beneficial for environmental protection.