Due to the long distance from the coastline and mild environmental conditions, the sea near islands has become a key area for the development of aquaculture. It is found that violent wave reflections near islands can lead to a relative concentration of wave energy, which easily causes structural damage to aquaculture facilities. Most of the studies on the dynamic response characteristics of aquaculture facilities have been focused on the flat seabed areas, while there are fewer studies on the sea near islands. To solve this problem, the dynamic response of a hinged multi-body floating aquaculture platform deployed in the sea near islands in the survival condition are studied in this paper by means of physical model experiment. The results show that the presence of island increases the surge motion of the platform and the maximum value of power spectrum density increases by 61.78% compared with that of the flat seabed. The significant value of the cable force on the windward side of the platform increases by 2.03 times compared with that of the flat seabed in the survival condition. At the same time, the wave reflection caused by the island topography has transferred the position of the platform with the largest heave motion from the cage on the windward side to the middle cage. The pitch motion of the platform has been decreased, but the relative rotation between the middle cage and other cages has been increased. The results provide a theoretical reference for the design of aquaculture facilities and mooring system deployed in the sea near islands.