The present invention relates to a liquid mixing device which has a control system and electronic regulation, in charge of receiving the parameters set with respect to the liquid which is expected to be supplied by the tap or supply means whereto said device is connected and which acts on the regulation means of the different supply lines of liquids to mix to achieve said parameters, which has a high measurement and actuation dynamic thanks to measuring sections with ultrasonic transducers and proportional solenoid valves and a configuration and geometry of said measuring sections which allows having a multitude of reliable measurements per second.