The invention provides a punching machine for grounding flat iron. The punching machine comprises a support and an operation table mounted at the upper end of the support. A first hydraulic cylinder mounting base is arranged on the operation table. A first hydraulic cylinder is mounted on the first hydraulic cylinder mounting base. A first punch mounting base is mounted on the side, close to the operation table, of the first hydraulic cylinder mounting base. A first punch is mounted on the side, close to the operation table, of the first punch mounting base. A first waste channel is arranged on the side, close to the first punch, of the operation table. A second hydraulic cylinder mounting base is also arranged on the operation table. A second hydraulic cylinder is arranged on the second hydraulic cylinder mounting base. A second punch mounting base is arranged on the side, close to the operation table, of the second hydraulic cylinder mounting base. A plurality of punches are mountedon the side, close to the operation table, of the second punch mounting base. A second waste channel is formed in the side, close to the second punches, of the operation table. The grounding flat ironis located between the first punch and the operation table. By adoption of the punching machine for the grounding flat iron, the punching efficiency and quality of the grounding flat iron can be effectively improved.