The basic nutrients, amino acid composition and mineral element content of seven marine fishes were determined, and the amino acid was evaluated for nutrition. At the same time, the upper limits (UL) of nutrients were used to assess the mineral elements in fish muscles. Health risk analysis. The results showed that there were no significant differences in the crude ash content of the seven marine fishes, and the crude fat and water contents were significantly different. Larimichthys polyacits had the highest crude fat content and the lowest water content, which were 9.44%±0.29% and 71.64%±0.44%, Scarus ghobban had the highest water content, the lowest crude fat content, and the crude protein content was between (18.56%±0.29%) and (20.97%±0.32%), the difference was significant; seven marine fishes amino acid species were complete, and the ratio of ∑EAA/∑TAA and ∑EAA/∑NEAA is in line with the FAO/WHO ideal model, with the limiting amino acids Val, Trp, Met+Cys, and the essential amino acid index between 77.57 and 89.04; 7 tested mineral elements in fish muscle were rich, and the content of the same elements in different fish species was significantly different. The average content of K element was the highest and the difference of Na element content was the most significant. The risk assessment of mineral elements showed that Zhuhai sampling had the maximum risk index of Cu in fish in the age groups of 2-5, 6-17, 18-44, 45-59 is greater than 100%, which is an unacceptable risk range, and the average risk index is within the acceptable range. The above results may provide a reference for the deep processing of marine fish and the daily diet of residents.