A structure of speaker for ship having a base seat, a vibration board connected to a vibration shaft, and a coil seat containing a coil, characterized in that a coil housing enclosing an iron block therein, being made from iron is mounted in between the base seat and the coil seat so as to obtain the effect of magnetism concentration, the magnetism is formed when a current is passed through the coil and the magnetism is concentrated at the iron block which in turn attracts the vibration shaft to move downward, and drives, the vibration board to produce vibration, which produce sound.