The utility model relates to an artificial limb knee joint with the function of automatically adjusting the resistance level, which is suitable for connecting the thigh part and the lower leg part of a lower limb artificial limb, and comprises a knee joint body, a processor, a resistance unit, a gravity sensor and a memory.The processor is arranged in the knee joint body.The resistance unit, the gravity sensor and the memory are all arranged in the knee joint body and are electrically connected with the processor.When a user wears the lower limb prosthesis and acts, the gravity sensor regularly sends a pair of gravity signals corresponding to the current action state of the user to the processor, which sets a pair of resistance levels for the resistance unit according to the multiple gravity signals received in a time period.一種具有自動調整阻力層級功能的義肢膝關節，適用於連接一條下肢義肢的大腿部及小腿部，並包含一膝關節本體、一處理器、一阻力單元、一重力感測器及一記憶體。該處理器設置於該膝關節本體內。該阻力單元、該重力感測器及該記憶體均設置於該膝關節本體內，並與該處理器電連接。當一使用者穿戴該下肢義肢而動作時，該重力感測器定時發送一對應該使用者目前動作狀態的重力信號至該處理器，該處理器依據在一時間週期內所接收到的多個重力信號對該阻力單元設定一對應阻力層級。
