Abstract: The present invention relates to a functional beverage composition comprising chlorella and deep sea water. The composition comprises 0.1-5 wt % of chlorella powder, 90-99 wt % of deep sea water, 0.001-0.5 wt % of a grapefruit extract, 0.01-5 wt % of honey, 0.01-5 wt of polydextrose, 0.001-1 wt % of citric acid, and 0.001-0.1 wt % of enzyme-treated stevia. Thus, the functional properties of deep sea water and chlorella, including antioxidant, anticancer, anti-inflammatory, cerebral vascular and cardiovascular disease inhibitory and anti-diabetic functions, can be provided by taking the beverage composition.