Submarine cable connection operation device and operation method thereof

The invention discloses a submarine cable connection operation device and an operation method thereof and relates to the technical field of submarine cable maintenance operation. A submarine cable maintenance ship is prone to secondary damage when a submarine cable is pulled into water. The submarine cable connection operation device comprises a cable guiding device fixedly connected with a hull,a connecting room and a cable traction winch. The cable guiding device comprises water outlet guide roller sets, a locking guide roller set, a horizontal guide roller set, a U-shaped guide roller setand a guide rail, wherein the protruding outboard portions of the water outlet guide roller sets are arc-shaped in the transverse direction and the vertical direction; the two water outlet guide roller sets are installed on the same side of a ship board; the locking guide roller set is provided with a safety locking device for fixing a cable. After cable connection is completed, the U-shaped guideroller set can slide to a