The invention discloses a discharging device for an automatic knife grinder. The discharging device comprises a foundation platform, a first support and a second support. The foundation platform is further provided with a telescopic device supporting frame. A telescopic device is arranged on the telescopic device supporting frame. A first swing arm pointing to the second support is hinged to the top of the first support. A second swing arm pointing to the first support is hinged to the top of the second support. A discharging rod fixing block is arranged at the tail end of the first support. Two discharging rods upwards extending obliquely are arranged on the discharging rod fixing block. By means of the manner and the discharging device of the automatic knife grinder, the upwards-tilting action of the discharging rods is achieved through the telescopic device, surgical knife blades slide to the bottoms of the discharging rods along the discharging rods to be stacked, working efficiency is improved, and the automation degree of the automatic knife grinder is easily improved.