The saw comprises a
machine body, the
machine body comprises supporting frames, fastening assemblies, a
cutting mechanism and an adjusting mechanism, the supporting frames are rotationally connected to the two sides of the adjusting mechanism, the fastening assemblies are movably connected to the bottom of the adjusting mechanism, the
cutting mechanism is movably connected to the front end of the adjusting mechanism, and the adjusting mechanism is movably connected to the front end of the adjusting mechanism. The adjusting mechanism is used for controlling the
machine body to advance
underwater; during
underwater cutting, the adjusting mechanism controls the supporting frame to rotate, so that the supporting frame is supported at the water bottom, the fastening
assembly clamps the to-be-
cut piece, and the cutting mechanism conducts cutting. The cutting method comprises the following steps: a, preparation before cutting; b,
underwater supporting; c, fixing; and d, cutting. The machine body is controlled to advance underwater to a to-be-
cut position, the fastening
assembly clamps a to-be-
cut part to be matched with the supporting frame, the cutting stability is greatly improved, the cutting precision is improved, meanwhile, manual cutting is achieved through
wireless underwater operators, the cutting efficiency is improved while the safety performance is improved, and the cost is saved.