Polishing head of metallographic rectangular polishing machine

The utility model belongs to an accessory of a metallographic rectangular polishing machine, and particularly to a polishing head of the metallographic rectangular polishing machine. The polishing head of the metallographic rectangular polishing machine is characterized by comprising a transmission shaft connected to the polishing machine, wherein a polishing grinding body for polishing a metal surface is arranged at one end of the transmission shaft; a blind hole is formed inside the transmission shaft; a screw thread is arranged at the inner part of the blind hole. According to the utility model, the steel polishing head of the polishing machine is designed, and the disadvantages that the traditional plastic polishing head is broken and deformed easily, but is replaced hardly are overcome through structural improvement and material replacement of the polishing head; in addition, the polishing head of the metallographic rectangular polishing machine improves flatness of a test surface efficiently, achieves g