Chain stopper for large ship

The invention relates to the technical field of marine anchoring equipment, and discloses a chain stopper for a large ship, a rotating shaft with an end outer ring being a tooth groove is movably connected between the inner sides of the top of a rack in a sleeving manner, a knife switch column is fixedly mounted in the middle section of the rotating shaft, and a knife switch controller is fixedly mounted on the outer side of the top of the rack and located at the same height as the rotating shaft; a driver is movably sleeved on the outer ring of the sleeve shaft in the rack, a hydraulic plug is movably sleeved on the inner ring of the sealing shaft sleeve, a pressure spring is fixedly connected between the outer side of the hydraulic plug and the inner wall of the switch blade controller, and Z-shaped hydraulic cavities are symmetrically formed in the middle of the inner walls of the two sides of the rack and located above and below the driver; the end, close to the roller, of each hydraulic cavity is movably