The invention discloses a high-temperature equipment lubricating oil, and relates to the technical field of the lubricating oil material. The high-temperature equipment lubricating oil is prepared from the following raw materials in parts by weight: 60-80 parts of base oil, 30-50 parts of thickening agent, 12-25 parts of auxiliary; the auxiliary is prepared from the following raw materials in parts by weight: 15-25 parts of antioxidant preservative, 8-20 parts of extreme pressure anti-wear agent, 10-25 parts of viscosity index improver, 2-8 parts of structure stabilizer, and 2-8 parts of metaldeactivator; the preparation method comprises the following steps: (1) mixing the base oil and the thickening agent; (2) preparing the auxiliary; and (3) preparing the high-temperature equipment lubricating oil. Under the high-temperature condition, the lubricating oil is stable in property and hard to volatilize, good in antioxidant performance, good in adhesion performance, and environmentallyfriendly, and the carbon deposition and the coking can be avoided.