Life education aims to educate juveniles to cherish and love life, and help them understand the essence and meaning of life and create the values of life. Foucault's existential aesthetics is a blueprint for free new life based on his own life experience and wisdom of Western philosophy. Its core principle of“caring for oneself”, primary goal of“physical and mental harmony”and ultimate orientation of“subject freedom”provide new ideological guidance for promoting and reforming modern life education practice.