The invention discloses an anti-oxidizing nanometer mixed oil with low cost. The anti-oxidizing nanometer mixed oil is prepared from the following components in parts by weight: 30 to 50 parts of mineral oil, 15 to 20 parts of rapeseed oil, 4 to 8 parts of olive oil, 6 to 12 parts of castor oil, 15 to 30 parts of anhydrous ethanol, 1 to 5 parts of composite antioxidant, 1 to 3 parts of nanometer SiO2 (silicon dioxide) particle, 1 to 3 parts of nanometer ZnO (zinc oxide) particle, 1 to 3 parts of nanometer A12O3 (aluminum oxide) particle, 1 to 3 parts of polymethacrylate pour point depressant,0.5 to 2 parts of passivating agent, 0.5 to 1 part of viscosity regulator, and 0.5 to 1 part of metal chelating agent. The anti-oxidizing nanometer mixed oil has the advantages that the better anti-oxidizing property is realized, the oxidizing speed of the mixed oil is delayed, and the service life is prolonged; the pour point is smaller, and the use requirement under the low-temperature environment is met; the good electric property and physical-chemical property are realized, and the cost is low.