Tower body structure for ship crane

The invention discloses a tower body structure for a ship crane. The tower body structure comprises a tower body and a cab. The top of the tower body is provided with a pulley part matched with a steel wire rope, and the bottom of the tower body is provided with a crane jib mounting part matched with a crane jib; the tower body comprises a lower cylinder structure, a middle cone structure and an upper cylinder structure which are connected in turn; the thicknesses of the lower cylinder structure, the middle cone structure and the upper cylinder structure are gradually increased; the diameter of the lower cylinder structure is greater than that of the upper cylinder structure; the lower cylinder structure is provided with a maintenance door hole; the middle cone structure is provided with a ventilating window hole and a cab hole; the upper cylinder structure is provided with an air inlet window hole; and the inner surface of the tower body is welded with reinforcing ring ribs and reinforcing longitudinal ribs. By the design, the requirement on the dimension of the tower body is met under 5-degree visual line, the manufacturing cost is low, the concept of equal strength design can be realized, and the tower body structure has light self weight, high structural strength and high firmness.