Water-cooling cooling polishing machine

The invention discloses a water-cooling cooling polishing machine which comprises an abrasive disc and a rotating shaft. A cavity, a water inlet channel and sliding grooves are formed in the rotating shaft. The water inlet channel, the cavity and the sliding grooves sequentially communicate. Sliding blocks are connected into the sliding grooves in a sliding manner. Springs are arranged between the sliding blocks and the inner walls of the sliding grooves. Water outlet grooves are formed in the rotating shaft and communicate with the sliding grooves. When the rotating shaft is static, the sliding blocks seal the corresponding water outlet grooves. The upper side face of the rotating shaft is provided with a funnel and a rubber bar. The funnel is connected with the water inlet channel. A water inlet pipe is arranged above the rotating shaft. A water outlet of the water inlet pipe is located above the funnel. A water outlet switch of the water inlet pipe is located on the moving track generated when the rubber bar conducts the circular motion. When the rubber bar pushes the water outlet switch, cooling water flows into the funnel through the water outlet of the water inlet pipe. The water-cooling cooling polishing machine cools the abrasive disc automatically when used, the service life of the abrasive disc is prolonged, and damage, caused by the too high temperature of the abrasive disc, to a polished object is prevented.