Provided are a method of extracting saponin which is the physiologically active component of Akebia quinata with high efficiency, by sequentially subjecting to a) adding Akebia quinata flesh to Akebia quinata seeds and performing aging; and b) extracting with alcohol, a method of further improving saponin extraction efficiency by adding ginger, and a food composition containing the extract produced by this method. Higher added value may be created by improving the saponin extraction efficiency from Akebia quinata seeds using Akebia quinata flesh which has not been utilized when extracting saponin.