Automobile speed sensors mostly use Hall type structure. Hall speed sensor is a kind of magnetoelectric sensor based on Hall effect. It has the characteristics of high sensitivity to magnetic field, stable output signal, high frequency response, strong ability to resist electromagnetic interference, simple structure and easy to use. In the 21st century, the global sensor market shows a trend of rapid growth amid constant changes in innovation. Experts point out that the main technology in the field of sensors will be extended and improved on the existing basis, countries will compete to accelerate the development and industrialization of a new generation of sensors, the competition will be increasingly fierce.