The invention discloses a dry-heating protecting control method and device for a humidifier and the humidifier. The method comprises the following steps: acquiring the voltage, for representing the running state of an atomizing piece, detected by an induction sensing circuit; if the detected voltage exceeds the theoretic maximum voltage, changing the detected voltage into the theoretic maximum voltage; if the detected voltage does not exceed the theoretic maximum voltage, maintaining the detected voltage; if the first preset number group of detected voltage is obtained, calculating an average value of the detected voltage in each group according to the preset rules, wherein each group of detected voltage includes a second preset number of detected voltage; if the average value of a third preset number group of detected voltage meets the preset condition, determining that the humidifier is in dry heating, and controlling the humidifier to stop running. According to the technical scheme, the method has the advantage that the dry-heating protection can be effectively performed for the humidifier.