The invention provides a dust treatment device for automobile brake disc grinding, and relates to the field of automobiles. The dust treatment device comprises a supporting frame, a fixing plate is fixedly mounted on the upper surface of the supporting frame, a supporting plate is fixedly mounted at the top end of the fixing plate, a telescopic device is fixedly mounted on the upper surface of the supporting plate, the bottom end of the telescopic device penetrates through the supporting plate, a mounting plate is fixedly mounted at the bottom end of the telescopic device, and two movable columns are fixedly mounted on the upper surface of the mounting plate. According to the dust treatment device for automobile brake disc grinding, a motor A, a connecting plate, L-shaped plates, movable rods, limiting rods, springs and grinding blocks are used in cooperation, the connecting plate can be driven to rotate by starting the motor A, under the elastic effect of the springs, the grinding blocks can make better contact with the grinding face of a brake disc body, and therefore in the polishing process that the polishing blocks make contact with the polishing surface of the brake disc body, the brake surface of the brake disc body is evenly stressed, and smooth grinding can be conducted.