The utility model relates to the technical field of corner manufacturing tools, in particular to a flat iron bending tool which comprises a base part and an operating part, the operating part comprises an operating handle, a horizontal plate and a vertical plate, the right end of the horizontal plate and the lower end of the vertical plate are fixed together, the operating handle is fixed to the right side of the vertical plate, and a sleeving through hole is formed in the horizontal plate. The base part comprises a base body, limiting rods and connecting rods. The limiting rods and the connecting rods are distributed on the top face of the base body in the left-right direction at intervals. The limiting rod is sleeved with the sleeving through hole, and the horizontal plate is located onthe base body. The utility model has a compact structure, the limiting rod is sleeved in the sleeving through hole; the operation part can rotate relative to the base; through the arrangement of the operation handle, a user can easily complete bending operation of the flat iron in a labor-saving mode, operation is easy, convenient and fast, standard unification of manufactured finished products can be achieved, construction efficiency can be completely improved, and the flat iron bending machine is suitable for bending operation of the flat iron, and particularly suitable for machining of grounding disconnection cards.