The invention discloses a feed barrel discharging device. The device comprises a support, a roller and a feeding device, wherein the roller is rotatably installed on one side of the support, the feeding device is arranged on the outer side of the roller, a gear ring is fixedly installed on the rear side of the roller, a transmission gear is meshed with the bottom of the outer side of the gear ring, a first motor fixedly connected with the transmission gear is fixedly installed in the support, a bearing cylinder is installed on the side, located outside the support, of the roller, a lead screwis installed on the outer side of the bearing cylinder, a second motor is fixedly installed at one end of the lead screw, a sliding groove parallel to the lead screw is formed in the bottom of the outer side of the bearing cylinder, and a clamping plate is rotatably installed on the lead screw. By arranging the roller, the bearing cylinder, the lead screw and the clamping plate, a feed barrel canbe clamped, the roller is driven by the motors to rotate, feed in the feed barrel is dumped, and use is convenient.