Four-color printing machine

The invention discloses a four-color printing machine which comprises a wall board module, a driving roller tensioning module, a scraper module, a scraper adjusting module and a sizing and water scraper module. The driving roller tensioning module, the scraper module, the scraper adjusting module and the sizing and water scraper module are arranged on the wall board module, an ink accumulation roller adjusting module, an ejection head module I and an ejection head module II are arranged on the driving roller tensioning module, and the ejection head module I and the ejection head module II are arranged oppositely. By means of the four-color printing machine, the phenomenon that a large amount of dyes is fed and discharged during printing does not occur, the dyes are saved, the pollutant discharging amount is small, and printing speed and printing quality are high.