The embodiment of the invention discloses a seat exchanging device and method. The seat exchanging device comprises a first track, mounting seats and a second track, wherein the mounting seats are arranged on the first track in a spaced manner and slidingly connected with the first track; the second track is arranged in the first track; the second track has a slide rail and a transferring part; and the slide rail communicates with the first track and the transferring part so that each mounting seat slides among the first track and the slide rail and the transferring part. The method comprisesthe steps of receiving a position exchanging request transmitted by a seat, positioned on the first track, to be moved; according to target position information of the seat to be moved and current position information of the seat to be moved and other seats on the first track, determining a position exchanging mode of the seat to be moved; and according to the position exchanging mode, determiningmoving trajectories of the seat to be moved and the other seats and enabling the seat to be moved and the other seats to move according to the moving trajectories. According to the seat exchanging device and method disclosed by the embodiment of the invention, as the slide rail of the second track communicates with the transferring part and the first track, the mounting seats for mounting the seat can slide among the first track, the slide track and the transferring part.