The automatic air release valve is applicable to the wet type, dry wet alternation, pre action, circulation, foam spray, foam storage tank and other fire-fighting systems in the automatic sprinkler system. It is installed on the top of the system branch pipe and filled with water to exhaust gas in the system to prevent air blockage and air plug; When it is full of water, it automatically closes the air outlet; Close the air outlet automatically when the system is maintained and drained; During system maintenance and drainage, the automatic exhaust and suction valve group automatically opens the suction to prevent the pipe network from being damaged due to negative pressure deformation