Ship battery replacement system and method

The invention relates to the technical field of ship battery replacement, in particular to a ship battery replacement system and method. The system comprises a ship body assembly, a battery box, a fixing assembly and a hoisting assembly. The fixing assembly comprises a first bottom support unit, a first guide unit and a second guide unit. One end of the first guide unit is detachably connected with the first collet unit, and the other end extends away from the hull assembly. The area of the first guide unit in the horizontal direction is gradually reduced in the direction from the hull assembly to the first bottom support unit. The second guiding unit comprises two first guiding modules and a driving part. One end of the first guide module is movably connected with the first collet unit, and the other end extends away from the hull assembly. The driving part is in driving connection with the first guiding module and drives the first guiding module to rotate with the joint of the first guiding module and the f