Abstract: According to the characteristic requirements of Internet of things of intelligent sensor, an autonomous positioning module is developed by using geomagnetic assisted inertial navigation/BDS combined positioning algorithm. The chip selection is based on the principle of low power consumption and localization. The module structure and circuit schematic diagram are introduced. The national production and low-power design are adopted in the hardware design, at the same time, the zero speed correction algorithm, quaternion method and geomagnetic auxiliary correction algorithm are adopted in the software to realize the storage and inversion of the moving trajectory of the intelligent sensor. The test shows that the moving track is highly similar to the actual loop. The measured distance of 378 m loop is 375.01 m, the difference is 2.99 m, and the relative error is 0.8%.