Novel device for determining release flux of water diffusing type methane

The invention discloses a novel device for determining release flux of water diffusing type methane. The novel device comprises a static box and an inverted funnel, wherein the bottom of the inverted funnel is opened; the inverted funnel is placed below the static box; a top methane air bubble outlet penetrates through the top surface of the static box and is positioned above the static box; and a diffusing type methane taking opening is formed in the top of the static box. According to the novel device, the funnel is arranged under the static box in an inverted manner and is used for collecting methane air bubbles, the methane air bubbles are prevented from entering the static box to interfere determination of the diffusing methane, and therefore, methane determination success rate is increased.