Improved mechanical processing lubricating oil comprises the following raw materials by weight: 6-9 parts of sodium sulfite, 4-7 parts of ricinoleic acid polyester, 3-5 parts of hydroxyl sodium sulfonate, 4-8 parts of polyethylene glycol monomethyl ether, 2-4 parts of ethanolamine, 7-9 parts of nitromethane, 3-6 parts of triethanolamine, 4-9 parts of Turkey red oil, 6-8 parts of low molecular polyethylene wax, 2-6 parts of benzene methanol, 3-8 parts of paraffin, 4-10 parts of tetramethylammonium hydroxide, 2-5 parts of methyl polytetrafluoroethylene, 1-4 parts of sodium hydroxide, 2-6 parts of epoxy ethane and 15-24 parts of base oil. The beneficial effects are that the mechanical processing lubricating oil can be used to well play the lubricating and cooling effect, reduces the friction, and has good high temperature tolerance.