The utility model provides an air water linkage protector of cutting off water supply, including the valve body, the main entrance that the valve body link up about being provided with, the upper portion of main entrance is provided with horizontal water passageway, the lower part of main entrance is provided with inlet channel and air outlet channel, is provided with the case in the main entrance, the diameter of case and the internal diameter phase -match of main entrance, the middle part of case is provided with the path that one section diameter is less than the main entrance internal diameter, forms gaseous UNICOM room between path and the main entrance, the lower extreme of main entrance is provided with the end cap, the end cap with be provided with compression spring between the case. This air water linkage protector of cutting off water supply configuration is on the pneumatic tool, and in a single day the water passageway is closed or cut off the water, and the gas passagewayis also closed thereupon, cuts off the air tool power supply, and it has the explosion -proof safe handling problem that requires the place in trades such as mine, petrochemical industry to have solved the pneumatic tool effectively, has eliminated the potential safety hazard that exists during the pneumatic tool uses.