Municipal bridge supporting device convenient to adjust

The municipal bridge supporting device convenient to adjust comprises a base, a cavity is formed in the base, a plurality of air cylinders are arranged in the cavity, a top plate is installed at the top ends of the air cylinders, a fixing block is arranged on the right side of the upper end of the top plate, a first supporting plate is arranged at the upper end of the fixing block, and a shaft sleeve is arranged in the fixing block. A screw rod is rotationally connected into the shaft sleeve, a handle is installed at the right end of the screw rod, the left end of the screw rod is rotationallyconnected with an installation plate through a bearing seat, the installation plate is fixedly installed on the top plate, the screw rod is sleeved with a movable block located between the installation plate and the fixed block, and a second supporting plate is arranged at the upper end of the movable block. The second supporting plate can move, so that the supporting device can support differentpositions, the supporting