The utility model relates to a laser marking machine and elevating gear thereof. The elevating gear of foretell laser marking machine includes bottom plate, first frame, second frame, crossbeam and adjusting part, a frame attach is on the bottom plate, the 2nd frame attach is on the bottom plate, and the second frame is parallel to each other with first frame, the both sides difference sliding connection of crossbeam is on first frame and second frame, on first frame was located to the adjusting part, the output and the crossbeam of adjusting part were connected, and the adjusting part is usedfor adjusting the distance between crossbeam and the bottom plate. Foretell laser marking machine and elevating gear thereof, because all there is the support at the both ends of crossbeam, for traditional cantilever support's elevating gear, the elevating gear's of this application structural rigidity is better, has solved elevating gear's the relatively poor problem of structural rigidity.