The utility model discloses a floating ship berthing device, which comprises an upper berthing platform, and is characterized by comprising an upper berthing platform, an anchor chain and a lower foundation device, wherein the upper berthing platform comprises at least one cylinder-shaped floating body, and the lower foundation device comprises at least one suction anchor; and one end of the anchor chain is connected with the bottom of the upper berthing platform in a tensioning way, and the other end thereof is connected with the lower foundation device in a tensioning way. The utility model solves the problems that the fixed berthing structure has little displacement and large reaction force; and the structure has small reaction force and large displacement, so that the device is not only safe and reliable, but also reduces the amount of steel for the structure to achieve the purpose of reducing the cost.