The invention discloses a marine 
thick plate bending process. Before being processed, a marine 
thick plate is a 
flat panel, and after being processed, curvature 
radius of the middle of the 
thick plate is required to be small while curvature 
radius of both ends of the thick plate is required to be large. A sectional cold bending method is utilized and includes firstly, 
processing the two ends of the marine thick plate through segment moulds; and secondly, 
processing the middle of the marine thick plate through a pressing mould. Self-made moulds used in the marine thick plate bending process are simple, practical and adjustable, 
processing and forming requirements on high-intensity thick plates within a 
large range can be met, curved thick plate products meeting different 
engineering requirements can be processed on the same 
pressure load, surface profiles of the processed products are smooth, indentations of the products are shallow, service requirements can be met completely, difficulty in processing of the high-intensity thick plates can be reduced, and production of 5100TEU container vessels can be promoted. In addition, quality defects of obvious indentions, scratches and crush damages caused by high deformation resistance generated in a single pressing process are avoided.