Ink color mixing device, printer and printing method

The invention discloses an ink color mixing device, a printer and a printing method, and the ink color mixing device comprises an ink barrel assembly composed of a plurality of ink barrels (1); a peristaltic pump assembly composed of a plurality of first peristaltic pumps (2); the electromagnetic valve assembly consists of a plurality of first electromagnetic valves (3); the first-stage ink bottle assembly is composed of a plurality of first-stage ink bottles (5); the ink barrel assembly comprises an ink barrel (1), a first-stage ink bottle (5), a mixing bottle (8), a second-stage ink bottle (12) and a spray head (13), and in the ink barrel assembly, each ink barrel (1) is connected with one first-stage ink bottle (5); each primary ink bottle (5) is connected with two first peristaltic pumps (2), a first electromagnetic valve (3) and a first liquid level floating ball switch (6), one of the first peristaltic pumps (2) is used for feeding ink, the other one of the first peristaltic pumps (2) is used for discha