Aiming at the problem of short service life of the sensor and low anti-electromagnetic interference ability. In this paper, an inductance-capacitance separation sensor is designed. This structure not only prolongs the life of the reading coil, but also reduces the interference of the parasitic capacitance of the inductor and the resistance of the reading coil to the sensitive signal, and also improves the sensitivity of the sensor. The performance of the sensor was tested in the temperature range of 100℃⁓1300℃, and the results showed that the coupling distance between the sensor and the coil antenna was within 10mm, and the resonant frequency of the sensor shifted to the left regularly with the rise of temperature, and the measurement sensitivity was as low as 2 kHz/℃, up to 7 kHz/℃. It can be seen from the test results that the sensor can be applied to temperature monitoring in harsh environments and the test results are reliable.