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The production of fucoxanthin and fatty acids in <i>Conticribra weissflogii</i> has been examined, but there is still a lack of understanding regarding the impact of trace elements, including iron, on their co-production. To address this knowledge gap, this study investigated the effects of FeCl₃·6H₂O on the growth, fucoxanthin, and fatty acids of <i>C. weissflogii</i>. The findings revealed that the highest cell density (1.9 × 10⁶ cells mL⁻¹), cell dry weight (0.89 ± 0.15 g L⁻¹), and total fatty acid concentration (83,318.13 µg g⁻¹) were achieved at an iron concentration of 15.75 mg L⁻¹, while the maximum carotenoid and fucoxanthin contents were obtained at an iron concentration of 3.15 mg L⁻¹. The study demonstrated that the content of the active substance in <i>C. weissflogii</i> could be increased by adjusting the iron concentration, providing new information as to the more efficient co-production of fucoxanthin and fatty acids and offering experimental support for large-scale production.