The invention belongs to the technical field of ship manufacturing and discloses a rapid manufacturing method for a ship block. The rapid manufacturing method comprises the following steps: carrying out three-dimensional modeling on a ship block; dividing the structure in the ship block into a planar component and a curved surface component according to a three-dimensional modeling result; dividing the planar component into a plurality of planar plate frames according to the positions of the planar component and the curved surface component in a three-dimensional model, a mounting sequence and a connecting relation of the components, and dividing the curved surface components into a plurality of curved surface plate frames; processing the planar plate frames and the curved surface plate frames; and sectionally mounting the processed planar plate frames and curved surface plate frames, and combining, so as to form the ship block. The rapid manufacturing method is a sectional manufacturing method, the processing efficiency, manicuring precision and linear control reliability of a large-sized catamaran are improved.