The utility model belongs to the technical field of shipbuilding and oceanography engineering, a polygon floating production storage unit is disclosed, adopt the main ship body of regular polygon column barrel, arrange etc. Through flare structure, damping sheet, under -deck to obtain good seakeeping and construction process nature by configuration optimization, through equipment selection such asdesign of central shaft and pump cabin type pumps, it has shortened the arrange pipeline of equipment to each tank in the space to save arranging of deck, reduces the equipment investment, through optimization put forward chain ware pattern, the mooring line is arranged, obtains to have the multi -point mooring system of technique and price competition advantage, avoids being equipped with the single point moored system who costs an arm and a leg, reduces project investment, improvement localization rate effectively promotes marginal oil field's development, through 2 outer defeated modes that conventional oil took turns, comply with the primary climate direction, improve the outer defeated frequency and reliability, or passed through a bit outer defeated mode of DP shuttle tanker, mobility is good, and the operation receives environment and weather effect little.