Exoskeleton knee joint rehabilitation robot

The invention relates to an exoskeleton knee joint rehabilitation robot. The exoskeleton knee joint rehabilitation robot is based on a single-degree-of-freedom four-link bionic knee joint structure of artificial muscles and comprises thigh fixing mechanisms, four-link bionic knee joint mechanisms and shank fixing mechanisms, wherein upper parts of the thigh fixing mechanisms are fixedly connected through single ends of the four-link bionic knee joint mechanisms, the other ends of the four-link bionic knee joint mechanisms are fixedly connected with lower parts of the shank fixing mechanisms, and lower parts of the thigh fixing mechanisms are connected with upper parts of the shank fixing mechanisms through artificial muscles. The thigh fixing mechanisms serve as a fixed platform, and the shank fixing mechanisms serve as a movable platform. The bionic knee joint can achieve planar single-degree-of-freedom movement of a knee joint and achieve flexion and extension movement of the knee joint under driving of the