The present invention relates to a use of a banana stamen extract for promoting hair growth. The banana stamen extract according to the present invention promotes gene expression of VEGF and IGF1 to enhance the proliferation level of hair follicles, so that the density of hairs grown is increased. In addition, the banana stamen extract also inhibits gene expression of SRD5A1, SRDA2 and AR to decrease hair loss, and promote the gene expression of KROX20 so as to significantly enhance hair growth.