The invention relates to a hammer knife type plate edge peeling-off device which comprises a rack. A horizontal conveying belt mechanism for transversely conveying a plate edge is arranged on one side of the rack, conveying rolls are arranged at the position, at the other side of the horizontal conveying belt mechanism, in the middle of the rack at intervals, and a horizontal plate edge peeling-off roll driven by a driving mechanism is longitudinally arranged on the upper sides of the conveying rolls and provided with a plurality of tooth type hammer knives which can be turned over and used for peeling off the plate edge. The device is compact in structure and good in peeling-off effect, and can be conveniently used for peeling off the plate edge.