Abstract: An antiaging assessment method for facial rejuvenation is provided. Firstly, a spatial relationship between various facial key points of an under-test facial image are precisely described. Consequently, a facial feature is obtained. The spatial relationship is an angle relationship or a length relationship. Then, a feature change comparison between the facial feature and reference feature is performed. Consequently, a feature change value is obtained. According to the at least one feature change value, a facial rejuvenation score index is acquired from a corresponding feature change value range of a facial rejuvenation score index data table. The present invention also provides an antiaging assessment device for facial rejuvenation.