The petroleum workover rig or well servicing rig is mechanically and hydraulically driven. The power system, drawworks, mast, travelling system and transmission mechanism of the workover rig are mounted on the self-propelled chassis, which improved the operation efficiency dramatically. Hook load of our workover rig covers from 40 metric ton to 225 metric ton, drawworks power from 250 to 1000 HP, featuring large operation load, reliable performance, excellent off-road performance, convenient movement etc.