Painting method for a ship hull block or the like

The painting method comprises a baking process in which electrostatic painting powder is scattered uniformly on both surfaces of a steel plate, which is subjected to shop primer painting or chemical conversion coating treatment after being shotblasted or pickled, the unnecessary portions of scattered electrostatic painting powder on the steel plate is removed by means of a suction nozzle moving under numerical control, and thereafter the scattered electrostatic painting powder on both surfaces of the steel plate is baked by the high-frequency baking method; an intermediate assembly block process in which the baked steel plate is cut into a predetermined shape under numerical control, and a related steel plate is welded to the unpainted portion to form an intermediate assembly block; a major assembly block process in which a plurality of intermediate assembly blocks are welded to each other to form a major assembly block; and an integrated assembly block process in which the major assembly block is subjected to secondary surface treatment by pickling, and thereafter secondary painting is performed on the major assembly block before forming an integrated assembly block.