The invention relates to bird's nest and colla corii asini cakes and a preparation method thereof. The bird's nest and colla corii asini cakes provided by the invention are prepared from colla corii asini, bird's nests, walnut kernels, black sesame seeds, crystal sugar, honey and yellow wine. The products namely the bird's nest and colla corii asini cakes are obtained through the steps of dissolving the colla corii asini, decocting the treated colla corii asini and bird's nests, and preparing colla corii asini cakes. The bird's nest and colla corii asini cakes prepared through the formula and the preparation method provided by the invention are mild in nature, and people do not suffer from excessive internal heat when eating the bird's nest and colla corii asini cakes; and besides, the bird's nest and colla corii asini cakes can promote metabolism by nourishing yin and tonifying qi, and the effects of tonifying qi and blood, nourishing yin, moistening dryness, maintaining beauty and keeping young are enhanced. In addition, when the preparation technology provided by the invention is used, under the premise that no any preservatives are added, the guaranteed period of the bird's nest and colla corii asini cakes can reach 1 year or above, and the products are green and healthy.