The utility model discloses a microbubble purger, including the accelerating tube that from top to bottom sets gradually, with the bottom sealing connection's of accelerating tube reducing pipe, laminate and install in the toper net of reducing pipe bottom, still include the shell subassembly, the accelerating tube top be equipped with central single inlet opening and accelerating tube inside be equipped with with the passageway that entries of central single inlet opening intercommunication, the passageway intercommunication and along accelerating tube outside terminal surface screw set's a plurality of spiral guide groove of being equipped with and entrying on the upper portion outside terminal surface of accelerating tube, the well lower part of accelerating tube is equipped with with the exhalant canal of spiral guide groove intercommunication and in extending to the accelerating tube, the upper portion of accelerating tube is equipped with and switches on the inlet channel of passageway of entrying, a plurality of spiral guide groove uses the axle center of accelerating tube to surround the circumference in the accelerating tube for central spiral. This microbubble purger has and concentrates the speed intaking and to go out water high efficiency, reinforcing blowout rivers, effectively reduces the external shell -side wall of rivers or the impact of accelerating tube and the advantage of wearing and tearing.