Underwater directional cutting equipment for concrete cutting and cutting method thereof

The invention relates to the technical field of concrete cutting, in particular to underwater directional cutting equipment for concrete cutting and a cutting method of the underwater directional cutting equipment. The driving mechanism drives the rotating disc to drive the rope saw to rotate so as to cut a concrete building; the other end of the rope saw penetrates through the clamp; the clamp can be fixed on an underwater concrete building under the condition that a worker does not enter the water; according to the underwater directional cutting equipment for concrete cutting, after a first block, a second block and a third block enter water, a worker pulls a rope saw to enable the first block and the second block to rotate around a bridge pier, then electromagnets on the first block and the second block enable the first block and the second block to be attracted together, and then the first block and the second block are separated; and the output end of an electric push rod extends into a second fixing gro