Compared with the traditional wheel-rail train, the maglev train is more vulnerable to lightning strikes due to the lack of contact net protection. In severe cases, it will cause damage to the vehicle-mounted equipment and affect the safety of the train. In order to analyze the indirect effect of lightning on maglev train, the 3D model of maglev train was established, and the CST transmission-line matrix method was used to study the coupling law of cables inside the maglev train under lightning strike. The simulation research result showed that different types of cables had different coupling characteristics, and the induced current on the shielded cable and the unshielded cable was obviously different. With the increase of the distance between the unshielded cable and the bottom of the vehicle, and the increase of the length of the cable, the induced current of the unshielded cable showed an increasing trend. The proposed method could effectively simulate the indirect effects of cable coupling caused by lightning strikes on maglev trains, and laid a foundation for further research on the protection technology of indirect lightning effects of maglev trains.