A buffer mechanism of an artificial limb is provided, including a joint connecting base (20), an artificial limb connecting base (10), a first connecting rod (30) connected to a front side of the joint connecting base (20), a second connecting rod (40) connected to a rear side of the artificial limb connecting base (10), and a buffer cylinder (5, 60) disposed between the first connecting rod (30) and the second connecting rod (40) and having a sleeve (7, 61), a cylinder plug (6, 62) and a spring (8, 63). The cylinder plug (6, 62) is detachably disposed at one end of the sleeve (7, 61), the side surface of the first connecting rod (30) facing the second connecting rod (40) is disposed with a roller arm (50), an end of the roller arm (50) is pivotally connected with a roller (51), and the roller arm (50) contacts the end face of the cylinder plug (6, 62) by the roller (51). The present disclosure can reduce the wear rate of the cylinder plug (6, 62) and decrease the friction force.一種義肢關節緩衝機構,包括:一關節連接座、一義肢連接座、一第一連桿、一第二連桿、及一緩衝缸體;其中第一連桿與第二連桿分別樞接於關節連接座與義肢連接座的前側與後側;其中緩衝缸體設置於義肢連接座介於第一連桿與第二連桿之間的位置,緩衝缸體具有一套筒、一柱塞、及一彈簧,柱塞可滑動地套設於套筒的一端,第一連桿面向第二連桿的一側面設置一滾輪臂,滾輪臂末端樞接一滾輪,並透過滾輪接觸於柱塞的端面。藉此,關節裝置產生動作時,滾輪臂以滾動接觸方式與柱塞接觸,以減少柱塞磨損,並減少阻力。1‧‧‧關節裝置10‧‧‧義肢連接座11‧‧‧夾持部12‧‧‧中心基線13‧‧‧內螺孔20‧‧‧關節連接座21‧‧‧關節承載面30‧‧‧第一連桿40‧‧‧第二連桿50‧‧‧滾輪臂51‧‧‧滾輪52‧‧‧滾輪支架53‧‧‧滾軸60‧‧‧緩衝缸體61‧‧‧套筒611‧‧‧外螺紋部62‧‧‧柱塞63‧‧‧彈簧64‧‧‧底塞
