Aiming at the problem that it is difficult to calibrate the magnetic field center of magnetic beacon in the location of ultra-low frequency magnetic field generated by magnetic beacon, a high-precision magnetic beacon calibration method based on the distribution characteristics of magnetic induction intensity of magnetic dipole is proposed.In order to describe the magnetic field distribution of the magnetic beacon at any position in space, the equivalent magnetic dipole model of the magnetic beacon is established.Through the relationship between the components and positions in different directions of the magnetic induction intensity, the central position of the magnetic field of the magnetic beacon coil is solved, and the adaptive exponential smoothing algorithm is used to reduce the influence of its own fluctuation on the magnetic induction signal, thus to realize high-precision calibration of the magnetic beacon magnetic field center.The finite element simulation of the calibration method shows that the calibration accuracy of the magnetic field center using the distribution characteristics of magnetic induction intensity is at the millimeter level.Through the comparison of the positioning accuracy before and after calibration, it is found that the positioning accuracy of the calibrated magnetic beacon is effectively improved.