A kind of artificial limb knee joint,Comprising a upper joint part,Once joint piece,One buffer unit,One air flow regulator and an interlinked mechanism,Hypozygal part defined an airtight space,One first gas runner and a second gas runner,Buffer unit includes a rod piece and a plug member,Airtight space is partitioned into a upper chamber and a lower chamber by plug member,Air flow regulator includes the first air valve of a setting what first gas runner,And one setting what second gas runner the second air valve,Interlinked mechanism is arranged between what upper joint part and hypozygal part,Upper joint part can be rotated by interlinked mechanism relative to what hypozygal part,And interlinked mechanism can drive in plug member what airtight space through rod piece and move up and down.一種義肢膝關節，包含一上關節件、一下關節件、一緩衝裝置、一氣流調節裝置及一連動機構，下關節件界定有一氣密空間、一第一氣體流道及一第二氣體流道，緩衝裝置包括一桿件及一塞件，塞件將氣密空間區隔成一上氣室及一下氣室，氣流調節裝置包括一設置於第一氣體流道的第一氣閥，及一設置於第二氣體流道的第二氣閥，連動機構設置於上關節件與下關節件之間，上關節件可藉由連動機構相對於下關節件轉動，且連動機構能透過桿件帶動塞件於氣密空間內上下移動。
