A saccharide-free hard or soft spirulina candy for supplementing nutrients to human body is disclosed. Said hard candy is prepared from spirulina, maltose, xylitol, sweetening agent, citric acid, malic acid, potassium sorbate, sodium chloride, apple essence and glycerin. Said soft candy is prepared from spiruline, chitosan, sweetening agent, xylitol, refined konjak starch, citric acid, malic acid, potassium sorbate, sodium chloride, apple essence and glycerin.