An embodiment of the present invention provides a nanocarrier in a micelle structure, a pharmaceutical composition for diagnosis of cancer, comprising the same nanocarrier, and a method for preparing the same nanocarrier. The nanocarrier is obtained by dispersing a water-in-oil nanoemulsion containing an oil phase ingredient, a surfactant, and an aqueous phase ingredient inclusive of a cancer cell fluorescence-inducing substance and a cancer cell-targeting polysaccharide in water to remove the oil phase ingredient, whereby the nanocarrier includes the aqueous phase ingredient.