Polishing device and polishing system

The utility model provides a polishing device and a polishing system. The polishing device comprises a rack, a storage rack, a polishing disc and a positioning device, the storage rack is mounted on the rack, a workpiece placing position is arranged on the storage rack and used for placing workpieces, the polishing disc is mounted on the rack and used for polishing the workpieces on the storage rack, and the positioning device is mounted on the rack and used for positioning the workpieces on the storage rack. And the positioning device is used for positioning the position of the rack when the polishing disk finishes polishing. The polishing system comprises a polishing device and a feeding and discharging device, the polishing device is used for polishing a workpiece, the feeding and discharging device is arranged adjacent to the polishing device and used for feeding and discharging the workpiece on the polishing device, and after the polishing device completes polishing, a positioning device of the polishing device positions a rack. And the feeding and discharging device is used for discharging the polished workpieces and feeding the workpieces which are not polished. The positioning device arranged on the polishing device can solve the problem of clearance shaking caused by accumulated errors of a gear transmission system, and therefore accurate positioning is achieved.