The invention discloses a polishing device and method. The polishing device comprises a first lead screw, a second lead screw, a polishing wheel, a transmitting panel and a receiving panel. A first infrared transmitter and a second infrared transmitter are fixed to the transmitting panel. A first infrared receiver and a second infrared receiver are fixed to the receiving panel. The first infraredtransmitter and the first infrared receiver are arranged oppositely, and the second infrared transmitter and the second infrared receiver are arranged oppositely. The polishing device and method are suitable for polishing curved glass with the various sizes and shapes. Black light-shielding ink is smeared at the polishing edge of the curved glass, and after the black light-shielding ink is solidified, a light-shielding strip is formed. The optical induction principle of the first infrared transmitter, the second infrared transmitter, the first infrared receiver and the second infrared receiveris utilized, through pushing of a first air cylinder and a second air cylinder, the height of the polishing wheel is adjusted to keep consistent with the height of the polishing edge of the curved glass all the time, and thus the polishing wheel can always polish the polishing edges of the curved glass. The polishing device is simple, high in processing efficiency and high in automation degree.