Marine tourism is a characteristic brand of Guangdong tourism，as well as one of the pillar industries of Marine economy in Guangdong Province. Based on the research of industry chain, the relevant standards of the Classification of Marine and Related Industries (GB/T20794-2021) and the Statistical Classification of National Tourism and Related Industries (2018) were combined, the Marine tourism industry chain was sorted out, the marine tourism industry chain and various industry segments in Guangdong Province synchronously were analyzed. The results show that the marine tourism industry chain in Guangdong is relatively complete, all aspects are involved. There are still insufficient in the cultivation of marine tourism formats, weaknesses in the manufacturing of facilities and equipment, and imperfections in training and leasing of marine tourism services in Guangdong's marine tourism industry chain at present.