The present invention relates to a byproduct of wine having a function for improving skin and to a manufacturing method thereof. In the present invention, provided are a cosmetic composition, a pharmaceutical composition and an external application to the skin composition including the byproduct of wine. In addition, in the present invention, provided is a natural composition for improving skin without side effects, which has effects of improving damaged skin and preventing skin from being damaged wherein the byproduct of wine having a function for improving skin is manufactured by the following step of crushing grapes. Specifically, the step of crushing grapes includes steps of securing grapes as a raw material； selecting the same； removing the stem of the grapes； putting the same in a crusher； and crushing the same.본 발명은 와인 부산물 및 이의 제조방법에 관한 것으로서, 피부 개선능에 탁월한 효과가 있는 것을 특징으로 한다. 본 발명은 이러한 와인 부산물을 포함하는 피부 개선용 화장료 조성물, 약학 조성물, 피부 외용제 조성물 등을 제공한다.
