Ship construction method and ship

The invention discloses a ship building method and a ship, the ship building method comprises a building dividing method and a segmented building and folding method which are carried out in sequence, and the building dividing method comprises the steps that a box-type keel is divided into an icebreaking segment keel structure and a loading segment keel structure, and the icebreaking segment keel structure and the loading segment keel structure are arranged in the length direction of a ship body; the icebreaking section keel structure is close to the bow of the ship body relative to the loading section keel structure; and in the height direction of the ship body, the part, located above the box type keel, of the ship body is divided into a first outer plate sheet body structure and a second outer plate sheet body structure, the first outer plate sheet body structure is correspondingly distributed above the icebreaking section keel structure, and the second outer plate sheet body structure is correspondingly di