The present invention relates to a low-molecular collagen peptide and a method for preparing a food composition by using the same and, more specifically, to a method for preparing a low-molecular collagen peptide, the method sterilizing chicken-feet under high pressure steam, degrading the same with a weak acid containing calcium hydride, removing fat from the degraded chicken-feet and concentrating the same, and then putting mixed lactic acid bacterial strains therein so as to cause fermentation, and to a method for preparing: a companion animal nutritional supplement composition, the method preparing a decocted liquid by preparing the low-molecular collagen peptide prepared by the method therefor, mixing, with the peptide, medicinal herbs including Rhynchosia Nolubilis, black soybean, Nelumbo nucifera Gaertner seeds, and Myristica fragrans Houttuyn seeds, and concentrating the same by means of a low-temperature decompression process and a food composition, the method preparing a decocted liquid extracted by mixing, with the peptide, medicinal herbs including Acyranthes bidentate Blume, Eucommia ulmoide, Carthami Flos seeds, Chinese quince, Cinnamomi Ramulus, and acanthopanax. The present invention increases safety when used in food, medicine, cosmetics and the like, by using calcium hydride, which is not a strong acid such as sulfuric acid or hydrochloric acid, which is used in a conventional preparation of a low-molecular collagen peptide. The companion animal nutritional supplement composition prepared by using the prepared low-molecular collagen peptide is a prescribed nutritional supplement, which satisfies a preference of a companion animal and reflects the habits and tastes of a carnivorous companion animal, thereby being widely applicable to dermatitis, fungal skins, knee joint and hip joint dislocation caused by musculoskeletal weakness, fracture diseases and the like.La présente invention concerne un peptide de collagène de faible poids moléculaire et un
