An improved structure of a cutting tool includes a body, a moving base, and a roller base. The body has a track groove whose one side is extended upward with a stopping wall. The moving base is disposed to slide in the track groove and mounted with a cutting wheel. The moving base is connected with a transmission element so as to move along the track groove. The roller base is disposed between the moving base and the stopping wall. More than one elastic element is disposed between the roller base and the stopping wall. The elastic elements generate a deviation when the roller base is under a force. The roller base has at least two rollers corresponding to the cutting wheel.