The invention discloses a badminton training service robot. The robot adopts a chassis with omnidirectional wheels to move freely, and comprises a ball picking area, a sorting and transferring area, aball passing area and ball storing areas. Badminton balls are unidirectionally conveyed in the robot in the feather direction, so that damage to feathers is minimized. The ball picking area is composed of a visual sensor and a connecting rod mechanical arm. The sorting and transferring area is mainly composed of gear sets of a spring resetting mechanism, a movable pulley stroke multiplying mechanism, a mechanical counting mechanism, a cylinder changing mechanism and a linkage mechanism. The ball passing area is composed of a conveying chain with dead point clamps and a ball outlet in the upper portion. Each ball storing area is composed of an empty ball box and a full ball box. When empty ball cylinders are transferred from the empty ball boxes to the ball storing areas, ball cylinders full of balls enter the full ball boxes for storage. In use, the robot has a ball storing mode and a transferring mode. The robot can efficiently collect badminton balls scattered on the ground and flexibly store and transfer the badminton balls inside, and the robot replaces manual work to pass balls for trainees.