The invention discloses an adjustable cut-off type antiaircraft exhaust valve including a valve body, wherein connecting seats are arranged on the top portion and the bottom portion of the valve body,and the surfaces of the connecting seats are provided with fastening screws. A water outlet device is arranged at the bottom portion of the inner wall of the valve body, and a regulating device is incommunication with the top portion of the valve body, and an air outlet device is arranged on the top portion of the adjusting device. Through providing the water outlet device, steam water accumulated in the valve body is accumulated in a water outlet shell after passing through a water outlet filter net, so that the situation that the steam water which is accumulated in the valve body for a long time corrodes the inner wall of valve body is avoided, and the service life of the valve is improved. Through providing the regulating device, the impact force generated by steam flowing promotes asliding filter layer to move, and the impact force of the steam is buffered. Through the effects of a sieve plate and a multi-layer diversion screen, the liquid doped in the steam is filtered down. Through providing the air outlet device, different numbers of outlet solenoid valves which are arranged on an air outlet are controlled and open by staff to exhaust. The adjustable cut-off type antiaircraft exhaust valve is free in adjustment, and the effect of effective regulation is achieved.