Robot arm

The utility model discloses a robot arm. The robot arm comprises a shoulder rotating joint (1), a shoulder lifting joint (2), an elbow rotating joint (3), a forearm lifting joint (4), a hand rotating joint (5) and a hand opening and closing joint (6). The robot arm achieves integration of mechanical arms of multiple degrees of freedom, optimizes weight and size and meanwhile enhances the flexibility of the mechanical arm, and can achieve multi-sensory fusion and target recognition and perform precisely-positioned object gripping; the flexibility of the mechanical arm is comprehensively enhanced, the weight of the mechanical arm can be optimized substantially, and the control method of the robot arm is simple and convenient to control.