The invention provides a self-cleaning ink supply manner for a printing plate of an intaglio printing press. An impression roll is arranged above the printing plate. The printing plate is arranged on a printing trolley. One side of the printing plate is provided with an ink uniformizing device. The front end of the ink uniformizing device is provided with a row of ink spray holes. The rear end of the ink uniformizing device is provided with an ink inlet hole. The lower end of the ink uniformizing device is provided with an ink uniformizing knife. The other side of the printing plate is provided with an ink scraping knife. A big ink groove is formed below the printing plate. An ink outlet pipe at the bottom of the big ink groove is connected with an ink supply cylinder. An ink supply pipe on the ink supply cylinder is connected with the ink inlet hole in the ink uniformizing device. A soaking ink groove is formed in the big ink groove and on the lower portion of a printing roll. The lower portion of the printing plate is soaked in oil ink in the soaking ink groove. One side of the lower portion of the printing plate is provided with an ink uniformizing roll. The surface of the ink uniformizing roll is close to the surface of the printing plate. By the adoption of the technology, the service life of the ink uniformizing knife and the ink scraping knife is prolonged, a gap between the ink uniformizing knife and a silk screen can be adjusted and increased in the ink coating process so that impurities can pass, the silk screen is soaked in the soaking ink groove, the impurities are washed away, and then the quality of printed products is better.