Timon of Athens was claimed to be Wil iam Shakespeare’s last tragedy. Since its birth, it aroused as much attentions as Shakespeare’s own great popularity. This paper, from the perspective of pychoanalytical criticism, adopts Jacques Lacan’s theory of disintegration in the subject, to demonstrate that Timon’s tendency from one-sided philanthropy to one-sided misanthropy is in effect a process of his superego’s conflicting with his id, and the internal source of his tragedy is his own insatiable desire to be acknowledged rather than others.