The utility model relates to a positioning device of vertical frame belongs to the field of automobile
manufacturing technology, it includes the
fixed frame and two stand column units for positioning vertical frame, the vertical frame includes bottom crossbeam, top crossbeam and two frame stands between bottom crossbeam and top crossbeam, bottom crossbeam is set up on the
fixed frame through the sliding mechanism, under the action of sliding mechanism, vertical frame can move between initial position and jointing position, the stand column unit is located in the side of frame stand for positioning frame stand. The sliding mechanism includes rack, gear and sliding motor of driving gear rotation that are engaged with rack, the utility model simple structure, convenient operation, the positioning of vertical frame is stable, safe and reliable, guarantees the positioning accuracy of vertical frame, and different pincers can be installed on vertical frame and positioned, to satisfy the flexible jointing production requirement of automobile.