The invention discloses a glass mold cavity 
polishing device which comprises a support, a base plate, a fixing mechanism, a movable rack, a roller, a motor, a driver, a tensioning wheel, an inner mold and an 
abrasive belt. The base plate is arranged below the support, the fixing mechanism is arranged on the base plate, the movable rack is arranged above the support, the roller is arranged on the movable rack, the motor is arranged at the rear end of the roller, the tensioning wheel is arranged on the movable rack, the 
abrasive belt is connected to the tensioning wheel and the roller in a sleeved mode, the inner mold is arranged on the inner side of the 
abrasive belt, and the driver is arranged above the inner mold. In this way, the glass mold cavity 
polishing device has the advantages of being high in reliability, compact in structure, high in 
polishing efficiency, high in finished product precision, low in 
noise, convenient to use, good in adaptability, low in cost and the like, and has the wide market prospect in the field of mold 
machining at the same time.