The invention discloses a labeling machine used for labeling a vehicle frame. The labeling machine comprises a vehicle frame fixing device. The vehicle frame fixing device comprises a tensioning device box which is clamped to the vehicle frame through tension. The tensioning device box is connected with a first driving device driving the tensioning device box to open or close. The tensioning device box is fixedly connected to a main rotating shaft arranged in the X-axis direction. The main rotating shaft can rotate around the X-axis and the Y-axis respectively. The main rotating shaft is provided with a first braking device used for stopping the main rotating shaft from rotating around the X-axis and a second braking device used for stopping the main rotating shaft from rotating around the Y-axis. The first driving device, the first braking device and the second braking device are connected with a manual electromagnetic valve in a controlled manner. The labeling machine achieves mechanical fixing of the vehicle frame and can rotate in different directions, and thus a label can be conveniently pasted; labor waste is reduced, and labor intensity is relieved; and labeling quality is improved.