The device simulates the adduction and abduction of the upper limb on a horizontal plane, and strengthens the muscle chains of the active and antagonistic muscles. On the premise of ensuring the safety of patients, carry out efficient training; The two-way hydraulic resistance can start from the lowest limit set, with small inertia, so as to avoid damage to patients during use; Comfortable use experience. Special design is adopted for the stressed parts of joints, which conforms to the principle of human morphology.