The invention discloses a mooring device for a ship. The mooring device comprises a float, a mounting end, a ring groove, a locking end, a mooring cable and a connecting end, wherein the bottom end ofthe mounting end is fixedly connected to the top of the float; the ring groove is formed on the surface of the mounting end; the ring groove is sleeved with the locking end; one end of the mooring cable is fixedly connected to one side of the locking end; one side of the connecting end is fixedly connected to the other end of the mooring cable; the locking end comprises a sliding sleeve; the sliding sleeve is close to the side of the mounting end; the front side and the rear side of the inner wall of the sliding sleeve are connected by a sliding rod; two sliding blocks are slidably connectedto the inside of the sliding sleeve and connected to the sliding rod in a sleeving manner; two ends of the sliding rod are both sleeved with pressing springs; and face-to-face ends of the two pressingsprings are separately and fixedly connected to opposite ends of the two sliding blocks. In the mooring device for the ship, two shifting rods are pulled oppositely to place two semi-circular clamping plates on two sides of the ring groove; and under the action of the pressing springs, the semi-circular clamping plates are clamped in the ring groove so that the mooring cable and the float can bequickly connected.