The invention relates to a dust removing device. The dust removing device comprises a containing cavity (2) used for containing cleaning liquid. An ultrasonic generation part is arranged in the containing cavity (2). An opening for the edge portion of a glass base plate (1) to stretch into the cavity is formed in the side wall of the containing cavity (2), and brushes (4) which can abut against the surface of the glass base plate (1) are densely arranged on the edge of the opening. By means of the above technical scheme, the edge portion of the glass base plate stretches into the containing cavity, the cleaning liquid in the containing cavity forms an ultrasonic solution under the effect of an ultrasonic generation part, ultrasonic bubbles in the solution are exploded in a grinding range ditch continuously, glass powder and grinding powder in the grinding range are removed out, and cleaning of the grinding range is achieved. The brushes abut against the surface of the glass base plateso that the cleaning liquid in the containing cavity cannot flow outwards in the cleaning process, and it is ensured that the cleaning process is conducted smoothly.