Abstract: To realize 3-degree-of-freedom（3-DOF） 6-pole hybrid magnetic bearing（HMB） nonlinear decoupling control with high precision, a control strategy based on the linear/nonlinear active disturbance rejection switching control（SADRC） was proposed. Firstly, the basic structure of the 3-DOF 6-pole HMB system was introduced, and a mathematical model of suspension forces was derived by using the equivalent magnetic circuit method. Secondly, the advantages and disadvantages of linear active disturbance rejection control（LADRC） and nonlinear active disturbance rejection control（NLADRC） were analyzed, and a switching strategy was proposed. Furthermore, the linear/nonlinear active disturbance rejection switching controller was designed to realize the decoupling control for the 3-DOF 6-pole HMB, and a simple practical parameter design method was provided. Finally, the SADRC simulation model and the experimental setup of a 6-pole HMB were built, and the results of simulations and experiments show that the proposed strategy is feasible and effective.