Lower limb exercise rehabilitation instrument

The lower limb exercise rehabilitation instrument comprises a fixing plate, a leg support, a sliding table guide rail, an auxiliary physiotherapy mechanism and a control system, one end of the leg support is rotationally connected with the top of the fixing plate, the other end of the leg support is rotationally connected with the sliding table guide rail, and the sliding table guide rail is detachably connected with the top of the fixing plate; the control system is placed on the side of the leg support. The leg support and the sliding table guide rail are matched to simulate bending and stretching movement of human legs, meanwhile, the auxiliary physical therapy mechanism can be used for assisting rehabilitation massage and infrared physical therapy while conducting the bending and stretching movement of the legs, the massage function of the shank part is provided by a shank massage bin, the massage air bag conducts extrusion massage on the shank part through inflation and deflation, and the massage effect