Ink supply structure of printing machine

The utility model discloses an ink supply structure of a printing machine. The ink supply structure comprises an ink pickup roller, a swing roller and an ink supply roller, the ink pickup roller is used for picking up ink in the ink box; the ink supply roller is used for supplying ink to the printing roller; a gap is formed between the ink pickup roller and the ink supply roller, and the swing roller is located in the gap; the swing roller is connected with a swing driving mechanism, and the swing driving mechanism is used for driving the swing roller to transfer the ink on the ink pickup roller to the ink supply roller in an intermittent mode. The ink supply structure of the printing machine is simple and reasonable in structure and can be applied to various printing machines, and the ink supply amount of a printing unit can be rapidly adjusted by adjusting the swing frequency of the swing roller. The water conveying amount and the ink conveying amount of the printing unit are accurately controlled in the pr