Is there a boat from Haikou to Xiamen?

No. There is no passenger ship from Haikou to Xiamen, so we can consider other modes of transportation, such as trains and planes. Haikou, also known as "Coconut City", is the capital of Hainan Province, the fulcrum city of the national "Belt and Road Initiative" and the core city of China (Hainan) Pilot Free Trade Zone (Hong Kong), located at 19 3 1'~ 20 04' north latitude and1/kloc-0 east longitude. Xiamen, referred to as "Xiamen" or "Heron", also known as Ludao, is a sub-provincial city in Fujian Province, a city with separate plans, a China Special Economic Zone approved by the State Council, an important central city, port and scenic tourist city in the southeast coast.