The present invention relates to a novel chlorin e6-folic acid conjugate, a preparation method thereof, and a pharmaceutical composition for the treatment of cancer comprising the same, and more particularly, to a novel compound prepared by linking chlorin e6 to folic acid, which effectively produces singlet oxygen in various media and has much better tumor selectivity than the known porphyrin-based photosensitizers, thereby being used effectively in photodynamic therapy for malignant tumors, a preparation method thereof, and a pharmaceutical composition for photodynamic treatment of solid tumors comprising the compound as an active ingredient.