The invention belongs to the technical field of gear machining, and particularly relates to a gear scrap cleaning device. The gear scrap cleaning device comprises a machine frame, a workbench is arranged on the machine frame, a hydraulic cylinder is arranged on the machine frame, a cutter is installed on a piston of the hydraulic cylinder, and a scrap cleaning device is arranged on the cutter; the scrap cleaning device comprises a first rotating shaft, a second rotating shaft, a third rotating shaft and a gear, the first rotating shaft, the second rotating shaft and the third rotating shaft are rotationally arranged on the side walls of the two ends of the cutter, the first rotating shaft and the second rotating shaft are connected with a chain, a first opening is formed in the cutter, the chain is meshed with the gear through the first opening, a connecting rod is arranged on the side wall of the hydraulic cylinder, the gear is fixed on the connecting rod. According to the scheme, the cutter is provided with a magnet and a second opening, so that scrap iron is sucked away when the scrap iron is just generated, the scrap iron cannot adhere to the gear, the gear is kept clean and dry, and the situation that the sight of an operator is affected by splashed scrap iron is avoided.