The invention discloses an automatic punching and discharging machine for a large-area zinc electrolyzing cathode plate. The automatic punching and discharging machine for the large-area zinc electrolyzing cathode plate consists of a feeding mechanism (14), a feeding manipulator (13), a material pushing device (2), a punching machine (4), an excess material collecting box (12), a sunk table flattener (6), a material bearing platform (7), a discharging manipulator (8), a plate material discharging mechanism (10), an infrared safety protecting rail (9), a console (11), a GGD cabinet (5), a hydraulic pipeline (1) and a hydraulic station (3). A 3.2m<2> zinc electrolyzing cathode plate is pushed onto the punching machine and the sunk table flattener through the feeding manipulator and the material pushing device and automatically punched and discharged, a sunk table at a release opening is manufactured, and the side edge of an aluminum plate is knurled. The automatic punching and discharging machine for the large-area zinc electrolyzing cathode plate has the obvious advantages of compact structure, high punching efficiency, high automatic degree, easy operation, reliable performance and the like; and multiple workstations work at the same time, so that a continuous production is realized.