The device (1) for the mixing of fluids comprises:—a first supply line (3) of a first fluid along which first valve means (4) are arranged, there being provided first control means (5) able to command the opening/closure of the first valve means (4);—at least a second supply line (6) of a second fluid along which second valve means (7) are arranged, there being provided second control means (8) able to command the opening/closure of the second valve means (7);—driving means (20) of the control means (5, 8) which comprise generation means (21, 22) of an impulsive driving signal (23) by pulses able to open the first valve means (4) and/or the second valve means (7) for an impulsive opening time (T-on) and to close the first valve means (4) and/or the second valve means (7) for an impulsive closure time (T-off), wherein the ratio between the impulsive opening time (T-on) and the impulsive closure time (T-off) for each pulse is constant and the pulses have a variable repetition frequency.