High-degree-of-freedom underwater mechanical arm

The utility model relates to the technical field of mechanical arm installation, in particular to a high-degree-of-freedom underwater mechanical arm which comprises a mechanical arm body, the top of the mechanical arm body is fixedly connected with an installation component through a fastener, and the installation component is composed of an upper plate, a lower plate and three identical connecting pieces arranged between the upper plate and the lower plate. The lower ends of the connecting pieces are rotatably mounted on the plate surface of the lower plate in a circumferential array manner, and meanwhile, the upper ends of the connecting pieces are rotatably mounted at the corresponding positions of the plate surface of the upper plate in a circumferential array manner, so that the problems that the degree of freedom of operation of a mechanical arm for underwater operation is not high, different operation requirements cannot be met, and the application range is small are solved; according to the mechanical