Steel box girder pushing support

The utility model relates to the field of bridge construction, and discloses a steel box girder pushing support which comprises a loading platform and a base, a lifting assembly is arranged on one side, opposite to the base, of the loading platform, a driving assembly is arranged at the bottom of the lifting assembly, and two clamping plates are connected to the top of the loading platform in a sliding mode. And the bottoms of the two clamping plates are fixedly connected with connecting plates, the bottoms of the two connecting plates are fixedly connected with moving blocks, the middles of the two moving blocks are in threaded connection with second threaded rods, the opposite sides of the two second threaded rods are fixedly connected with a double-end motor, and the bottom side of the double-end motor is fixedly connected to the inner bottom side of the loading table. According to the steel box girder lifting device, the two second threaded rods rotate to drive the two clamping plates to move oppositely t