Steel surface fireproof air pipe machining and bending device

The utility model relates to the technical field of bending devices, in particular to a steel face fireproof air duct machining bending device which comprises a retainer, a screw and a pressing plate, a screw hole is formed in the front end of the top of the retainer, the screw is connected with the screw hole in a meshed mode, sliding blocks are welded to the two sides of the pressing plate respectively, and the sliding blocks are connected with the pressing plate in a meshed mode. Sliding grooves are formed in the two sides of the holder correspondingly, the two sliding blocks are slidably connected with the two sliding grooves correspondingly, a first hydraulic cylinder is installed at the bottom end in the holder, a first hydraulic rod is installed on the first hydraulic cylinder, a top block is installed on the top of the first hydraulic rod, and a second hydraulic cylinder is installed at the top end in the holder. The second hydraulic cylinder is provided with a second hydraulic rod, and a pressing blo