Polishing positioning device, polishing machine and polishing feeding and discharging system

The utility model relates to a polishing positioning device, a polishing machine and a polishing feeding and discharging system. The polishing positioning device comprises a first driving mechanism and a first positioning part. The first positioning component is connected to the driving end of the first driving mechanism, the first driving mechanism can drive the first positioning component to move back and forth in the first direction, the first positioning component is provided with a limiting part, and the limiting part can be matched with one of a plurality of annularly-arranged pins on the polishing machine so as to lock a wandering star wheel of the polishing machine. According to the polishing positioning device, the arranged first driving mechanism drives the first positioning component to move towards the pins, so that one pin can be connected with the limiting part of the first positioning component in a matched mode, the wandering star wheel can be locked, and a product needing to be fed and discharged and the position of the wandering star wheel are kept fixed; the to-be-polished product can be placed in place, the polished product can be accurately grabbed and taken out, and the problem that the to-be-polished product is not placed in place or cannot be grabbed is solved.