In the research of rail vehicles, mechanism of curve passing is one of the hot spots, which essentially elucidates the conditions of vehicle curve passing and points out the direction for improving vehicle curve passing ability. As one of the new members of rail transportation, the curve passing capability of medium-low speed maglev directly affects its application and promotion in the field of rail transportation. In order to reveal the mechanism of curve passing for medium-low speed maglev, this paper first studies the necessary conditions for the conventional wheelset curve passing based on the mechanism of curve passing for the conventional wheelset. Second, on the basis of comparing the structure and motion relationship of the conventional wheelset, the independent wheelset and the magnetic wheelset (bogie of medium-low speed maglev), the theoretical derivation of the magnetic wheelset curve passing conditions are carried out to obtain its theoretical solution based on the curve passing conditions of the conventional wheelset. Finally, the conditions of curve passing for the magnetic wheelset are verified by dynamic simulation, and the mechanism of curve passing for the medium-low speed maglev bogie is revealed. Through the research, it can be found that: (1) The mechanism of curve passing for the magnetic wheelset is different from that of the traditional wheelset and the independent wheelset. The speed variance and regulating torque are the composite functions of running speed, curve radius, track gauge, superelevation, guiding stiffness and yaw angle of the magnetic wheelset. (2) When the magnetic wheelset passes through the curve, its motion posture switches between “” and “,” while the unilateral magnetic wheel shows a motion which is similar to “hunting.” (3) Ignoring the factors such as structure and irregularity, it can conduct that the curve capacity of the magnetic wheelset could be improved by increasing the curve radius, reducing the speed, curve superelevation and gauge to a certain extent. This study theoretically reveals the mechanism of curve passing for the medium-low speed maglev bogie, which provides a certain reference for the subsequent design of the medium-low speed maglev and the improvement of the medium-low speed maglev curve capacity.