PURPOSE: A cosmetic composition containing Bombycis corpus fermented extract is provided to strengthen skin barrier and to prevent itchness and xeroderma. CONSTITUTION: A method for manufacturing Bombycis corpus fermented extract comprises: a step of extracting Bombycis corpus with hot water at 80C for 18-24 hours to obtain hot water extract; a step of inoculating Saccharomyces Cerevisiae or Lactobacillus plantarum to the hot water extract; a step of fermenting at 28C for 72 hours and filtering; and a step of removing solid powder. A cosmetic composition for treating senile skin disease, squama and itchness contains 0.01-50 weight% of Bombycis corpus fermented extract.
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