The utility model relates to a correct limited equipment of knee joint bucking, correct limited equipment of knee joint bucking be equipped with bottom plate, thigh bracket, support, tray, weight, knee joint constraint area, hawser, the thigh bracket set up at the bottom plate head end, the support setting at the bottom plate tail end, the thigh bracket be adjustable thigh bracket, the support bethe adjustable support. Its advantage lies in, increase patient bucking scope, convert artifical gimmick to mechanical gimmick, raise the efficiency, steerable effect dynamics is convenient for writedown patient's treatment process, but utilize adjusting device, improve the comfort level of patient's treatment in -process, the clinical operation of being convenient for does benefit to the popularization.