High and low temperature core-pulling type temperature sensor

The utility model discloses a high and low temperature core-pulling type temperature sensor which comprises a flange, a reinforcing tube, an upper protection tube, an outer layer ceramic protection tube, a loose joint, a sealing assembly, a cheap metal thermocouple and a precious metal thermocouple, the flange and the reinforcing tube are welded into a whole, asbestos is wound outside the outer layer ceramic protection tube, and the outer layer ceramic protection tube is coated with refractory mortar to be connected with the reinforcing tube. The flange sleeve is in threaded connection with the loose joint and the upper protection pipe; the precious metal thermocouple and the cheap metal thermocouple are fixed and sealed through the sealing assembly I and the sealing assembly II after penetrating, the sealing assembly II adopts a clamping sleeve structure, so that the cheap metal thermocouple can be drawn out when the equipment is at high temperature, and can be reinserted for temperature measurement when the