The utility model provides a synchronous elevating device for sectional stepping beams, wherein two rollers and one end of a fixing frame are coaxially connected with a mandrel. The two rollers are movably inserted into a framework consisting of four tracks. One side of the framework is fixed to a connection plate through a bolt and the connection plate is welded onto the movable beam of a secondary-section stepping beam. The other end of the fixing frame is connected with a backing plate. The backing plate is welded with the movable beam of a primary-section stepping beam. One side of the fixing frame close to the backing plate is provided with a deflection wheel. According to the utility model, the rigid connection between the two sections of stepping beams is replaced by an independent device. Therefore, during the elevating process of the two sections of stepping beams, the non-synchronous elevating problem of the two sections of stepping beams caused by the difference of the response characteristics of proportional directional valves is solved through the rolling of the rollers in tracks. The elevating synchronism of the two sections of stepping beams is improved, while coil-falling accidents are avoided. The stepping beams are also protected from being damaged. The consumption of spare parts is reduced and the operation rate of a unit is improved.