The invention relates to the technical field of cutting processing fault diagnosis, specifically to a tool fault intelligent diagnosing system. The tool fault intelligent diagnosing system comprises aprocessing table, a disc saw placed on the processing table and a power device which drives the disc saw to reciprocate horizontally, wherein the processing table is provided with an infrared detector for detecting damage of a saw web and an alarm device controlled by the infrared detector. The system also comprises a gas storage tank, wherein a piston is arranged in the gas storage tank, and thepiston is connected to the power device through a connecting rod; a gas inlet and a gas outlet are formed in the gas storage tank, and the gas outlet communicates to a corrugated pipe; a cavity is formed in the disc saw, a gas jet opening is formed in the peripheral surface of the disc saw, the cavity communicates to the corrugated pipe and the gas jet opening, separately, a chip storage tank isarranged on the corrugated pipe, the chip storage tank is close to the gas jet opening, and an opening is formed in the side, close to the gas jet opening, of the chip storage tank. The tool fault intelligent diagnosing system provided by the invention can diagnose faults of the disc saw accurately by cleaning the saw web.