The invention provides a printing ink saving quantity statistical method and a printing ink saving quantity statistical device. The printing ink saving quantity statistical method includes: using a printing ink saving scheme to generate first dot matrix files of various colors, corresponding to a printing surface; using a printing ink non-saving scheme to generate second dot matrix files of the various colors, corresponding to the printing surface; calculating a dot percentage of each dot matrix file; calculating a saving amount percentage of printing ink of the various colors according to the dot percentages of all the first dot matrix files and the dot percentages of all the second dot matrix files of the various colors. The printing ink saving quantity statistical method and the printing ink saving quantity statistical device figure out the saving amount percentage of the printing ink of the various colors according to a statistical result obtained by calculating the dot percentages of all the first dot matrix files of the various colors, generated through the printing ink saving scheme, and the dot percentages of all the second dot matrix files of the various colors, generated through the printing ink non-saving scheme, and facilitate reasonable production schedules and printing ink allocation in the future.