Semi-synthetic metal cutting fluid prepared from regenerated lubricating oil and preparation method of semi-synthetic metal cutting fluid

The invention relates to a semi-synthetic metal cutting fluid prepared by utilizing regenerated lubricating oil, the semi-synthetic metal cutting fluid is prepared by utilizing the regenerated lubricating oil as base oil, and the semi-synthetic metal cutting fluid comprises the following components in percentage by weight: 15-25% of regenerated lubricating oil, 5-10% of a lubricating agent, 1-5% of a lubricating agent and the balance of a solvent. 1-5% of a corrosion inhibitor; 2-5% of an anti-wear reagent at extreme pressure; 5-10% of a pH stabilizer; 15 to 25% of a surfactant; 5-10% of an antirust agent; 10 to 20% of an oily lubricant; 0.1%-0.5% of a defoaming agent; 0.5-2% of a bactericide; 0.3 to 0.6 percent of essence; and the balance of deionized water. The treated waste lubricating oil is used as the base oil of the semi-synthetic cutting fluid, so that on one hand, the waste lubricating oil can be recycled to a greater extent, the problem that the waste lubricating oil is difficult to treat is solved,