Toni Morrison‘s work Beloved is a foundational text in Black feminist literary studies. However, the legal issues in it are also worth attention. From the perspective of law and literature, Beloved reveals the systemic oppression of Black motherhood under slavery, where maternal identity was commodified and legally reduced to reproductive utility. Yet Black mothers still actively sought a way out in this desperate situation. The protagonist Sethe‘s act of killing her baby was an extreme resistance against the power structure of slavery, attempting to regain her subject status. The support of the ―beloved community‖ also provided Black women with an ethical path beyond legal judgment, endowing Black mothers with new significance as subjects. At the same time, the novel reveals the moral ambiguity that the law has overlooked, providing ethical defense for the oppressed and giving Black mothers the possibility of narrative redemption and the return of dignity, echoing the call for poetic justice.