The invention relates to a synthetic oil lubricant and the preparation method. The synthetic oil lubricant comprises the raw materials with the following weight portions of 95-98.43 portions of base oil, 0.5-1 portions of antioxidant, 0.05-0.5 portions of metal deactivator, 0.02-0.5 portions of anti-rust agent and 1-3 portions of extreme pressure antiwear agent. Under the normal temperature, antioxidant, metal deactivator, anti-rust agent and extreme pressure antiwear agent are added into the base oil based on the weight portions, and then the temperature is risen to 50-70 centigrade. The mixture is stirred and mixed until the additives are completely dissolved. The finished lubricant is made after being filtrated and packaged. The lubricant is environmental protection without polluting, has good lubrication property, and is favorable for the maintenance and nursing of the equipment.