The invention discloses an integration automatic discharge and ball change planetary ball milling robot. A planetary gear is arranged outside a grinding tank at the upper end of a rack. A gear ring is arranged in the rack. The gear ring, the planetary gear and a sun gear form a planetary gear mechanism. The lower end of the sun gear is connected with a gear motor. The lower end of a tank body of the grinding tank is sleeved with a bottom barrel cover. Material discharge holes are distributed in the upper end outer wall of the bottom barrel cover. Ball discharge holes are distributed in the lower end outer wall. A lifting disc is arranged in the bottom barrel cover. A second push rod is connected to the center of the lower end of the lifting disc. After penetrating through the bottom face of the bottom barrel cover, the lower end of the second push rod is connected with a first push rod in a sleeved mode. The first push rod, the second push rod and a cylinder body jointly form a twin-stage cylinder. The edge of a tank opening is provided with a penetrating hole. A suspension rod is installed in the penetrating hole. The lower end of the suspension rod is connected with a top cover. A connecting rod is arranged at an end opening of a bottom barrel and is connected with the suspension rod. Through the integration automatic discharge and ball change planetary ball milling robot, separate automatic material discharge can be achieved, grinding balls can also be discharged automatically, discharged materials and the grinding balls are discharged separately, use convenience of a ball mill is improved greatly, and rapid production requirements are met.