The invention discloses a connector iron shell cutting mechanism. The connector iron shell cutting mechanism comprises a workbench, a push-up cylinder and an upper knife, and is characterized in that the push-up cylinder is arranged on the workbench, a connecting arm is arranged on a vertical moving piston rod of the push-up cylinder, one end of a balancing lever is connected with the connecting arm, the other end of the balancing lever is connected with a pressing block, and the bottom of the pressing block is provided with the upper knife. The top of the workbench is provided with a side plate, the top of the side plate is provided with a top plate, the bottom of the top plate is provided with a fixing block, the middle part of the fixing block is provided with a groove, and the balancing lever penetrates through the groove of the fixing block and is flexibly connected through a hinge pin. The connector iron shell cutting mechanism solves the problem that in a pressing process of the cylinder of the connector iron shell cutting mechanism, pressing force is not large enough, a product is easy to damage, thereby bringing unnecessary loss to a company, and increasing costs of the company, and the connector iron shell cutting mechanism is provided by which pressure is increased, cutting is steady and reliable, and product quality is substantially improved.