The utility model relates to an intelligent rehabilitation hand device for a pneumatic tendon. The mechanical arm comprises a palm panel, and a thumb component and four finger components which are fixedly mounted on the palm panel, the thumb component is used for thumb fixing and rehabilitation training; the four finger components are respectively used for fixing and rehabilitation training of theother four fingers; the thumb component comprises a thumb fixing unit used for fixing a thumb, a thumb pneumatic tendon used for driving the thumb to bend towards the palm, and a thumb mounting unitused for mounting the thumb fixing unit and the thumb pneumatic tendon. The finger component comprises a finger fixing unit used for fixing a finger, a finger pneumatic tendon used for driving the finger to bend towards the palm or the finger, and a finger installation unit used for installing the finger fixing unit and the finger pneumatic tendon. Compared with the prior art, the device is simplein structure and light in weight, safety is improved, the weight of the device is greatly reduced, and the rehabilitation effect is good.