The invention discloses a method for automatically identifying positions of double water temperature sensors in a water heater. The manner that a microcontroller, a detection circuit and the two watertemperature sensors are combined is adopted, water temperature values of the two water temperature sensors are detected to be compared, the two water temperature values are determined according to comparative results to correspond the upper water temperature value and the lower water temperature value, and the positions of the two water temperature sensors can be determined; the upper water temperature value is displayed on a displayer, a user can conveniently know the hot water temperature at an outlet of a pressure bearing water tank, and the lower water temperature value enables the microcontroller to conduct water temperature heating control over the pressure bearing water tank through the heater; and in the installing process, line distinguishing connection does not need to be carried out on the positions of the two water temperature sensors, appearance distinguishing does not need to be carried out on the two water temperature sensors, automatic identification can be achieved onthe positions of the two water temperature sensors, the production and manufacturing operation on the water heater can be simplified, and damage caused by connection errors of the two water temperature sensors to the water heater is avoided.