A joint movement supporting protection device, comprising a joint protection body (1) matched with a joint in shape, and a fixing device (2) connected or contacted with the joint protection body (1) and tightly attaching the joint protection body (1) to a joint of a human body. A plurality of upper notches (11) extending downwards from top but not penetrating through bottom are formed in a portion, close to a joint movement area, of the joint protection body (1). Thus, the joint protection body (1) is divided into a plurality of joint pieces (12). A junction of the upper notch (11) and a lower edge of the joint protection body (1) serves as a rotation fulcrum (13) between adjacent joint pieces (12). When the joint bends to a limiting position, the two adjacent joint pieces (12) on two sides of the upper notch (11) contact.
