William Carlos Williams was a twentieth-century American modernist poet and a central figure in post-war American poetry. His poems present things directly as they are, using straightforward skill with an intriguing ambiguity that is revealed only when the reader resonates with it. The poetry achieves such an effect, greatly influenced by empathy. Williams projected his emotions outwardly onto objects, endowing them with emotions, thus achieving a realm where feeling and setting are happily blended, and the identity of the matter and the self is explored. This paper will specifically analyze the phenomenon of empathy in Williams’s poetry from three perspectives: writing technique, choice of imagery, and aesthetic process, and explore the reasons for the recurrence of aesthetic empathy in his poetry. The aim is to address the inadequacies of current scholarly research on Williams’s poetry and to expand the discussion of the phenomenon of empathy within it. In terms of writing technique, Williams employs aesthetic empathy by using straightforward text, suitable phonetics, strong color contrasts, and unique line breaks. In terms of imagery, Williams’s poems are rich in imagery, encompassing all five senses and various types of empathy. Regarding the aesthetic process, Williams’s poems are highly romanticized and emphasize the expression of subjective personal feelings. Through analysis, this paper finds that Williams’s poetry embodies the phenomenon of aesthetic empathy throughout, setting off a wave of innovation in modern American poetry.