Connecting piece for I-shaped steel, hull structure and ship

The invention provides a connecting piece for I-shaped steel, a ship body structure and a ship, and relates to the field of ship structures. According to the connecting piece for the I-shaped steel, the hull structure and the ship, the connecting piece comprises the main body and the transition parts, so that the I-shaped steel can be arranged on the main body, the columnar components are arranged on the corresponding transition parts, and each transition part is arranged on the outer side of the main body; and each transition part extends towards the direction far away from the main body, so that the columnar component can be conveniently placed. Therefore, different transition parts (such as the thicknesses of the transition parts) are arranged to correspond to the columnar components, and then the columnar components are arranged on the transition parts, so that joist steel of different specifications and connection points of different columnar structures can be standardized, and the situation that differe