Safe bending fixing device

The utility model discloses a safety type bending fixing device, which relates to the bending field and comprises a supporting bottom plate, supporting vertical blocks are symmetrically welded at two ends of the supporting bottom plate, a fixing side plate is horizontally welded on one side edge, far away from the supporting bottom plate, of each supporting vertical block, and fixing through holes are uniformly formed in the top surface of each fixing side plate. The bottom ends of the supporting vertical blocks are in bolted connection with a bottom box body, side clamping grooves are vertically formed in the side edges between the supporting vertical blocks, an extrusion top plate is horizontally arranged on the side edges between the supporting vertical blocks, a fixed top plate is horizontally welded to the top ends of the supporting vertical blocks, and an extrusion air cylinder is in bolted connection with the top face of the fixed top plate. An inner movable groove is vertically formed in the inner sid