The invention discloses a method for preparing special numerical control machine tool lubricating oil. The method comprises the following steps: (1) preparing basic oil, namely mixing poly alpha olefin PAO basic oil with petroleum basic oil; (2) preparing a lubricating oil additive; and (3) preparing lubricating oil, namely mixing 75-95 parts by mass of the basic oil and 30-40 parts by mass of thelubricating oil additive for 2-3 hours, thereby obtaining a finished product after mixing is completed. A multi-step mixing method is adopted to prepare the lubricating oil; due to addition of the lubricating oil additive of special formula components, the lubricating oil is very good in self-lubrication property, friction can be very well reduced, a lubrication effect is ensured, and the methodis simple in preparation process and good in operability.