Cable maintenance robot for underwater pile foundation

The invention relates to the technical field of underwater robots, in particular to a cable maintenance robot for underwater pile foundation. The robot comprises a surrounding device, an executing mechanism and an underwater platform; the surrounding device comprises a suction cup type electromagnet, a tail end clamping device, a large arm, a surrounding device servo motor cabin, a surrounding device speed reduction cabin and the like, and the surrounding device can clamp a pile foundation so as to guarantee the reliability of overhauling operation; the executing mechanism comprises a four-degree-of-freedom mechanical arm and a tail end overhauling device, the tail end overhauling device comprises a high-pressure water gun, a welding gun, a water immersion probe, an industrial camera and a linear structure light sensor, and overhauling operation including scouring, flaw detection and welding can be achieved; and the underwater platform is an underwater robot with cables, after the pose of the underwater pile