Abstract: Macroalgae present a high capacity to absorb heavy metals in seawater, which is an ideal indicator of heavy metal pollution. Nineteen dominant species of macroalgae were collected from the seaweed farm of Gouqi Island in June 2017, and the contents of seven kinds of heavy metals (Cu, Zn, Cr, Cd, Pb, As and Hg) were determined using inductively coupled plasma source mass spectrometer, The average content order was: Zn > As > Cr > Cu > Hg > Pb > Cd. The contents of heavy metals in different phyla also varied, with higher contents of Cu, Cd and As in brown algae, higher contents of Zn and Cr in red algae, and higher contents of Hg and Pb in green algae. Compared with other sea areas in China, except for higher levels of Cu and Hg, other heavy metals contents in the Gouqi Island's macroalgae are at a medium or low level. Cluster analysis was performed on nineteen species of macroalgae, they could be divided into 6 categories, and the enrichment level of the each heavy metal could be divided into 3 categories. The results of correlation analysis suggested that there existed a significant correlation between Cu and Pb, Zn and Pb, and there existed an extremely significant correlation between Cd and As, Pb and Hg. The principal component analysis indicated that the Polysiphonia senticulosa showed the strongest comprehensive enrichment ability.