The joint function rehabilitation device has the function of helping the joints quickly resume their activities after the operation, and the joints can move freely after the recovery. And this joint function rehabilitation device is to provide a novel physical therapy, using the theory of continuous passive movement of the synovial joint, which is a postoperative rehabilitation therapy that is different from traditional rehabilitation methods. The joint function rehabilitation device is an orthopedic rehabilitation medical device. Based on the theory of continuous passive motion, it stimulates the human body’s natural resilience by simulating the natural movement of the human body, exerts the function of tissue compensation, and performs lower limb joint function recovery training. It has clinical applications It is safe and practical, pain-free, patient willing to accept, has a wide range of joint motion, effectively eliminates joint adhesion and necrotic joint survival, wound healing and swelling, promotes the self-repair of articular cartilage damage, and facilitates the transformation of transplanted periosteum into hyaline articular cartilage.