In the development process of industrial automation， AGV （automatic guided vehicle） is widely used， and one of the most widely used navigation methods is magnetic stripe navigation， which has the advantages of low environmental requirements， simple installation， easy maintenance and low cost. An AGV magnetic navigation sensor is designed， the sensor is designed with ARM Cortex-M3 as the core， RS232C line drive and magnetic navigation analog front-end design hardware experimental platform， real-time acquisition of magnetic navigation signals， the collected signal through the log-hyperbolic tangent function of the robust adaptive filtering algorithm， reduce the deviation during AGV driving， perform task cycle scheduling in the μC/OS III micro-operating system， and observe the real-time status of the sensor through the human-computer interaction interface, the running trajectory of AGV is corrected. The field experimental results show that according to the experimental data and simulation results， the AGV using the magnetic navigation sensor has less driving deviation and a smoother body.