Exhaust valve capable of improving exhaust efficiency

The invention provides an exhaust valve capable of improving exhaust efficiency. An air inlet hole for high-pressure gas to enter is formed in the lower end of a valve seat, a floating ball for opening or closing the air inlet hole is installed in a valve body, the upper end of the floating ball is connected with a twisted rod, a compression spring surrounds the twisted rod, the twisted rod is spirally sleeved with a circular ring with the inner ring being in a spiral shape matched with the twisted rod, a limiting device for preventing the circular ring from moving up and down is installed inthe valve body, and a plurality of fan blades which are annularly distributed at equal intervals and used for accelerating the discharge of the high-pressure gas are circumferentially connected to theupper end of the circular ring. The circular ring drives the fan blades to rotate, so that the discharge of the high-pressure gas from a main exhaust hole is accelerated, the exhaust rate is increased, the high-pressure gas i