A robot based on parallelogram principle comprises a base 1 provided with main shaft 3 which can rotate horizontally, one end whereof is provided with main shaft servo motor 5, and another – is connected with swinging arm component. Main shaft servo motor drives main shaft to rotate, and then drives the swinging arm component to swing circumferentially around main shaft. Free end of swinging arm component is connected with a gripper 12 for gripping the workpiece. Swinging arm component comprises first- and second swinging arm components which are mutually hinged together. By means of making two groups of swinging arm components mutually hinged end to end, each group forms two-parallelogram hinged structure, such that the workpiece gripped by gripper can be maintained in horizontal state during robot operation and stability of workpiece gripped can be improved.
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