The invention discloses antioxidant, anti-wear and antirust lubricating oil for an automobile gear. The lubricating oil is characterized by being prepared from the following raw materials: base oil, a clearing agent, a dispersing agent, a preservative, an extreme-pressure anti-wear agent, an oiliness agent, an antioxidant, a viscosity index improver, an antirust agent, a pour point depressant and an antifoaming agent, wherein in the base oil of the lubricating oil, the kinematic viscosity below 100 DEG C is 1.5-40mm<2>/s, the viscosity index is over 100, the pour point is below -25 DEG C, and the sulfur content is below 0.01% by mass. The lubricating oil for an automobile gear, disclosed by the invention, has the advantages of simple composition, low cost, relatively good viscosity index, high anti-wear property and long service life; the compatibility between the lubricating oil additive and the base oil is relatively good, and the lubricating oil is of relatively high stability; and compared with existing automobile lubricating oil, the automobile lubricating oil disclosed by the invention has high corrosion resistance, the preparation technology of the lubricating oil is simple, and the steps are simple and environment-friendly and easy to implement.