本文应用有限元法对磁流体密封的非线性轴对称磁场进行了分析计算,讨论了密封间隙大小、永磁体性能对密封的最大承压能力△P_(mxa)的影响.计算结果表明,△P_(max)随密封间隙增大而迅速下降,随永磁体性能提高而上升,而且在间隙较小时,永磁体性能对△P_(max)的影响更大. In this paper, the finite element method is used to analyze and calculate the nonlinear axisymmetric magnetic field of the magnetic fluid seal, and the influences of the size of the seal gap and the permanent magnet performance on the maximum pressure bearing capacity △ P_ (mxa) of the seal are discussed. (max) decreases rapidly with the increase of sealing gap, and increases with the increase of permanent magnet performance. And when the gap is small, the influence of permanent magnet’s performance on △ P_ (max) is greater.