The invention relates to a lower jaw rehabilitation robot, which belongs to the field of medical apparatuses and is used for assisting the rehabilitation training of the lower jaw of a temporomandibular joint disturbance syndrome patient in the vertical, left and right directions. The lower jaw rehabilitation robot structurally and mainly consists of a servo motor, a speed reducer, a spline shaft, two pairs of bevel gears, a sleeve, a shifting fork, a shaft, a connecting rod, a shifting fork handle, a positioning pin, a rotating shaft, a cylindrical cam, a roller driven element, a lower jaw connecting element, a crankshaft, a connecting rod, a rocker, a tooth supporter, a lower jaw supporting element, a spring and a machine frame, wherein the spline shaft and a slippage bevel gear form sliding connection; the rotating shaft is fixedly connected with a first fixing bevel gear and the cylindrical cam; the lower jaw connecting element is fixedly connected with the roller driven element; the crankshaft is fixedly connected with a second fixing bevel gear; the connecting rod is connected with the crankshaft and the rocker through hinges; the tooth supporter is fixedly connected with the connecting rod; the spring is fixed between the lower jaw support element and the machine frame. The lower jaw rehabilitation robot has the advantages that the device is compact; the operation is convenient and safe; the cost is low; the lower jaw rehabilitation robot can be used for hospital or family rehabilitation training.