Variable-rigidity flexible mechanical arm driven by electrofluid

The invention discloses a variable stiffness flexible mechanical arm driven by an electrofluid. A center cavity is formed in the middle of the interior of the flexible mechanical arm body, a plurality of side cavities which are arranged at intervals along the circumference are formed in the portion, outside the center cavity, of the interior of the flexible mechanical arm body, and the center cavity and all the side cavities are filled with dielectric liquid. An electrode driving assembly is fixedly installed on the upper portion of each cavity and used for driving liquid to flow. The sub-cavity where each electrode driving assembly is located is marked as an electrode chamber, a gap is formed between each electrode driving assembly and the top of the corresponding cavity and forms a liquid storage chamber, the cavity below each electrode chamber is marked as a deformation cavity, and fibers are arranged in the deformation cavities of the four side cavities and used for locally changing the rigidity of the fl