The transverse flux sensor is widely used in the magnetic bearing system due to its compact structure and high detection accuracy. With the development of magnetic bearing technology, higher requirements are put forward for the detection performance of the transverse flux sensor. To further improve the performance of the transverse flux sensor and meet the high-precision displacement monitoring requirements of the magnetic suspension rotor, this article designs and analyzes the sensor for the sensitivity index. By formulating the mathematical model of the sensor and the finite element analysis of the electromagnetic field, the relationship between the excitation frequency and the coil parameters is studied. The correlation between the number of turns of the sensor coil and the sensitivity is numerically studied. The influence of the skin effect on the sensitivity of the sensor is analyzed from the perspective of detecting the rotor. The sensor signal processing circuit is designed to realize the conversion from displacement signal to voltage signal, and an experimental platform is established to measure the output characteristics of the sensor. The experimental results show that when the sensitivity of the sensor is 20 mV/ μm, the detection range is ± 500 μm, and the linearity is 0. 69% . It has good dynamic characteristics, which is suitable for high-precision radial position detection of the rotor of the magnetic bearing system.