The utility model discloses a temperature sensing probe detector and belongs to the field of an instrument fire-fighting automatic alarm system. The temperature sensing probe detector comprises a housing, a fan, a DC motor, a temperature control protection circuit, a heating sheet and a thermally sensitive resistor. The two ends of the housing are respectively provided with an air inlet and an air outlet; the fan, the DC motor, the heating sheet and the thermally sensitive resistor are sequentially arranged in the housing; the fan is disposed at the air inlet; the thermally sensitive resistor is disposed to be near to the air outlet; the fan is arranged on the DC motor; the heating sheet and the thermally sensitive resistor are connected; the temperature control protection circuit is electrically connected with the DC motor and the heating sheet respectively; and the temperature control protection circuit supplies power by use of a 24 V DC power source. According to the utility model, DC low voltage is utilized for working so that the safety of detection in inflammable and explosive places is improved, the power connection process is saved, and the working load of detection preparation is reduced.