Shakespeare's Romeo and Juliet delves into the struggle of love under family feud and social discipline.From the perspective of Lacanian psychoanalysis,this paper analyzes the contradictory effects of the"object petit a"in love and the difference of subject between the hero and heroine under the interpellation of the"Big Other".And the voices of the foil characters reflects the paradoxes and the complexities of love in the context of the times,revealing its fleeting beauty and fragility under social discipline.The love depicted by the author is not essentially an earthly love disciplined by society,culture,and ethics,nor is it a passion governed only by physical appearance,but rather the intangible,elusive,and fragile love itself that cannot maintain lastingly in this world.The experience brought by this kind of love is like the desire described by the psychoanalytic critic Lacan,flowing along the signifier chain without a trace.This paper explores the theme of love in the drama in the context of Lacanian theory of desire and the author's humanistic pursuit of free and true love.