Farmers attach oyster seeds by combining oyster shells manually with lines in oyster longline aquaculture. This paper develops an automated machine for culturing and seed production with the aim of preparing alternate ways to increase productive efficiency and reduce fishing population. This study tries to increase productive efficiency and reduce production time followed by duplicate operations by unifying longline manufacturing processes for oyster culturing and seed production. This study also tried to realize performance with over 40 lines by automating attachment processes in manufacturing oyster seed shells using culturing PP lines. Mechanical harvesting after the 1990s has allowed longline farming methods to maintain a production capacity of 30,000-40,000 tons in oyster aquaculture. However, reduction in the fishing population is currently decreasing production capacity, which necessitates production automation. This study can be expected to improve production capacity and reduce labor costs for each household. It will also enable the industry to cope with unstable future labor demand.