The invention provides a post insulator glazing polishing device and its working principle, including a polishing device. The polishing device includes an upper top plate, a movable baffle, a fine polishing shaft, a lower bottom plate, a main body of a storage device, a middle polishing shaft, and a rough polishing shaft , sliding column, limit piece, screw rod and hole slot, the movable baffle is slidably connected to both sides of the lower end surface of the upper top plate, and the fine polishing shaft, middle polishing shaft and rough polishing shaft are rotatably connected to the upper top plate The lower end surface, the lower bottom plate is slidably connected to the lower end surface of the movable baffle, the main body of the storage device is slidably connected to the inside of the lower bottom plate through a sliding column, the stopper is fixedly connected to the inner side of the movable baffle, and the screw rod Rotationally connected in the limiter, the hole slot is set inside the movable baffle, and the front end of the polishing device is fixed in the middle with a touch display. The invention improves the production efficiency and quality of the post insulator, and at the same time Reduce the production cost of insulators.