In order to improve productivity and to solve the potential shortage of skilled workers in finishing manufacturing, a new type polishing robot, PR-PPRR, was proposed. The hardware of control system was discussed and the structure of control system was analyzed. In this paper, constant polishing force system and control algorithm of polishing force were discussed in detailed. In addition, the calibration of current and polishing force experiment was introduced. A programming system was provided for the system to generate the desired polishing path data. In order to evaluate the performance of the polishing robot system, a polishing experiment of faucet was done and it showed that the system reached design requirements.