Abstract: A valve repair device and a fixing mechanism for a clip piece assembly are provided. The valve repair device includes: a spacer element, the distal end thereof includes two end portion; an inner clip assembly, including a first inner clip arm and a second inner clip arm; a clip piece assembly, including a first clip piece and a second clip piece; an outer clip element, including a distal end part, a first outer clip arm, a second outer clip arm, and a clamping space; a first hinge structure; and a second hinge structure; in the state that the spacer element, the clip piece assembly and the inner clip assembly are located in the clamping space, the first outer clip arm and the second outer clip arm maintain opposite clamping forces.