The utility model belongs to the technical field of supersonic detection, and discloses a supersonic liquid level detection temperature control device comprising a supersonic signal generation receiver which is internally provided with a power supply. The supersonic signal generation receiver is connected with a supersonic transmitting probe and a supersonic receiving probe which are respectively arranged on tank walls with different heights of a tested tank body. The power supply is connected with a semiconductor refrigeration and heating device. The supersonic liquid level detection temperature control device has advantages that holes do not need to be arranged on the tank body, a supersonic liquid level switch is adopted to be directly installed on the external wall of the tank body and free upward and downward adjustment can be performed according to production requirements so that flexible control of upper limit and lower limit of different level is realized, heating or cooling of the tank body can be performed, and heating and cooling conversion is rapid and convenient.