The invention discloses environment-friendly anti-rust oil for a bearing. The environment-friendly anti-rust oil comprises 70-88% of base oil, 5-10% of film-forming agent, 2-5% of anti-rust agent, 2-5% of calcium dinonyl naphthalenesulfonate, 1-3% of high-base-number petroleum calcium sulfonate, 2-5% of dodecyl succinic anhydride and derivatives thereof, 0-1% of antioxidant and 0-1% of organic alcohol ether. The environment-friendly anti-rust oil has the advantages that the anti-rust oil is ultrahigh in rust resistance, dampness and heat resistance and salt fog corrosion resistance, good in human sweat replacement performance, environmentally friendly, safe, free of toxic and harmful substances and capable of passing ROHS certification; film-forming coating of the anti-rust oil is ultrathin, attractive, easy to clean and the like.