The purpose of this study is to examine the characteristics of the poetry of Jaime Gil de Biedma, a poet representing the poetry of Spain in the post-war era, and to analyze his representative poems. In the 1950s, when Spanish literature was culturally isolated and stagnant due to the state’s powerful censorship policy after the Spanish Civil War, Jaime Gil de Biedma introduced the concept of ‘the Poetry of Experience’, which was a literary alternative to overcome the excessive sentimentalism or subjectivism of Spanish poetry of Franco periods by intensively studying the 'dramatic monologue' of T. S. Eliot, an emblematic figure of modernist movement. The dramatic monologue seeks to reveal and overcome the state of a divided ego in the modern world through the tension and conflict between ‘I’, the poet, and the other self or alter ego of his consciousness. In addition, to avoid traditional and conventional poetic expressions, Jaime Gil de Biedma uses colloquial language used in everyday conversation, and embodies concrete common experiences in everyday life. Through this, Jaime Gil de Biedma imbued freshness and vitality into Spanish poetry during the Franco dictatorship, and ‘the Poetry of Experience’ introduced by him became an important poet of modern Spanish poetry.