Adjustable welding supporting device

The utility model relates to the technical field of reaction kettle welding, and discloses an adjustable welding supporting device which comprises a pedestal, a column table is fixed to the axis of the top of the pedestal, a screw cylinder is movably connected to the axis of the column table through a bearing, a screw is in threaded connection with the interior of the screw cylinder, and the top end of the screw is movably connected with a supporting table through a bearing. A worm gear is fixed to the center of the outer side wall of the screw cylinder, a transmission shaft rod is movably connected to one side of the column table through a bearing, a worm cylinder is fixed to the center of the outer side wall of the transmission shaft rod, and the worm cylinder is meshed with the worm gear. The hand wheel drives the worm barrel to be meshed with the worm gear to rotate through the transmission shaft rod, the worm gear drives the screw barrel to rotate in the column table, the screw can drive the supporting t