The invention provides a track-change device of a roller coaster. The track-change device comprises a main track, a rotating track and a drive device, wherein the area surrounded by the main track isan overhaul area, and a plurality of overhaul tracks are arranged in the overhaul area; the rotating track is arranged on the main track, the rotating track is provided with a rotation shaft, and therotating track is rotatably arranged on the main track by adopting the rotation shaft as the axis; the drive device drives the rotating track to rotate, wherein under the non-overhaul state, two endsof the rotating track are connected with and fixed with the main track, and serve as one part of the main track; and when track-change overhaul is needed, the drive device drives the rotating track torotate along the rotation shaft and enables one end of the rotating track to be connected with the overhaul tracks. With the device, while the track-change overhaul of the plurality of overhaul tracks is realized, the integral occupied area of the device can be effectively reduced, the overhaul and maintenance cost of the roller coaster is effectively reduced, and the overhaul period is effectively shortened.