Objective To explore nursing interns′ cognition and experiences regarding the concept of Shen Du (self-discipline in solitude) within clinical nursing practice, and to provide insights for professional integrity education and the cultivation of the Shen Du spirit. Methods Six undergraduate nursing interns were purposively sampled for semi-structured, in-depth interviews. Interview data were analyzed using interpretative phenomenological analysis (IPA). Results Three overarching themes emerged from the ana-lysis: the essence and core connotations of Shen Du; the practical value and encountered challenges of enacting Shen Du in practice; and internal and external factors influencing the practice of Shen Du. Conclusion Nursing interns demonstrate a predominantly positive understanding of Shen Du. To foster the gradual development of Shen Du awareness and its internalization through clinical practice, nursing educators should provide multi-dimensional support and targeted guidance.