Maritime habitation system and construction method of same

The invention is applicable to the technical field of building construction and provides a maritime habitation system and a construction method of the same, wherein the maritime habitation system comprises a deck floated on the sea face, a positioning plate, a residence installed on the deck and a fixation table fixed on a shore or the sea bottom; one end of the positioning plate can be vertically and movably installed on the deck, and the other end can be vertically and movably installed on the fixation table; the residence comprises at least one floor unit, and each floor unit comprises at least two basic modules, at least one expansion module and a floor plate; and the floor plate covers the top part of the basic modules and the expansion module, a connecting part is disposed on the basic module, connecting parts are also disposed on two side faces of the expansion module, and the expansion module is connected between the two adjacent basic modules in a dismountable manner. The maritime habitation system and the construction method of the same provided by the invention provide new space for people's residence lands, wherein sea filling is avoided, and human efforts and materials are saved; and each module is fabricated in a plate, so construction time is saved, and construction is accelerated.