A splint and a method for operating a splint are disclosed. The splint includes a plurality of plates, at least one rope, and at least one fastening drive device. The plurality of plates include a first plate. The rope is in movable connection with the plurality of plates. The fastening drive device is on the first plate, and is connected to the rope and configured to drive the rope under control, so as to allow the rope to be tightened or loosened under drive of the fastening drive device to drive the plurality of plates to move relatively close to each other or relatively away from each other.