Gravure press automatically cleaning printing plate supplies black mode, the roller platen is installed to the top of this printing plate, the printing plate is installed on the printing dolly, install even black device in one side of printing plate, the front end of even black device is opened there is one row of inkjet hole, open the rear end has into black hole, the lower extreme of even black device is equipped with even ink knife, the ink eraser is installed to the opposite side of printing plate, install the da mo groove in the below of printing plate, the black union coupling of play of da mo tank bottom portion supplies black jar, supply the black hole of advancing on the even black device of confession china ink union coupling on the black jar, at the da mo inslot, the lower part of printing roller, install and soak black groove, soak in soaking the printing ink of black inslot the lower part of printing plate, the rider roller is installed to lower part one side at the printing plate, the surface of printing plate is pressed close to on the surface of rider roller. This technique of adoption, the life of even ink knife and ink eraser increases, can adjust the clearance of even ink knife of increase and silk screen when scribbling the china ink, lets impurity pass through, and the silk screen is in soaking black groove, and impurity is by the erodea, and the product quality who later prints is better.