Leaves of Grass is the representative work of Whitman, an American poet, and the first collection of poems with American national style in the history of American literature. It created a generation of poetic style and had a great influence on American poetic circles. Poetry anthology enthusiastically eulogizes democracy and freedom. During the rising period of American capitalism, the boiling life in various States excited the poet. The spirit of democracy is the soul of Leaves of Grass. Leaves of Grass also has great innovation in artistic form. The poet broke the long tradition of American poetry and created a "free body" poetry form. In the poetic structure, the poet uses a lot of forms such as overlapping sentences, parallel sentences, long sentences, parallel sentences, etc., widely uses symbols and metaphors, and absorbs some common sayings, which has rich expressive force and eloquent style. Poetry is sincere and enthusiastic, bold and fresh in style, and it is sad to read.