The nuclear power industry has extremely stringent requirements for safety and reliability. As one of the key parameters in the operation of nuclear reactors, the accuracy of temperature measuring instruments must be strictly guaranteed. Dry-block calibrators play an extremely important role in temperature instrument calibration in the nuclear power field. In the cooling system of nuclear reactors, fuel rod temperature monitoring and temperature measurement of other key equipment, a large number of high-precision temperature instruments are in operation. Dry-block calibrators can simulate temperature environments under various operating conditions of nuclear power plants and accurately calibrate these temperature instruments, covering different ranges from normal temperature to high temperature and even ultra-high temperature. Through strict calibration procedures, it is ensured that temperature instruments can work stably and accurately in the complex and dangerous environment of nuclear reactors, providing reliable temperature data support for the safe operation of nuclear power plants. Any temperature measurement deviation may lead to misjudgment of the reactor state and then cause serious safety accidents, so the role of dry-block calibrators in nuclear power temperature instrument calibration is irreplaceable.