Abstract: The tribological performance of cold rolling emulsions with and without nano-TiO2 additive was compared by four-ball test and cold rolling copper plate test. Four-ball test results show that compared with conventional rolling emulsion, the friction reducing property and extreme pressure anti-wear performance of rolling emulsion with nano-TiO2 additive improved significantly. In cold rolling copper plate tests, using rolling emulsion with nano-TiO2 additive can effectively reduce rolling pressure and increase extreme depress rate, besides, it can repair the surface defects of cold rolled copper plate simultaneously, resulting in a better plate surface.