Purpose: While higher education has been encouraging interdisciplinary research, few studies have been conducted to understand how interdisciplinarity shapes the identity construction of scholars, especially doctoral students who may already strive to socialize into academia. Design/methodology/approach: Therefore, this study adopts the approach of autoethnography to analyze my lived experience of developing disciplinary literacy and constructing interdisciplinary identity as a Chinese international doctoral student at a North American university. Communication theory of identity (CTI) is the theoretical framework through which I understand the negotiation among my personal, enacted, relational and communal identities while communicating my research through diverse literacy practices. Findings: This autoethnography reveals that interdisciplinary doctoral students can flexibly use discursive resources from different disciplines and literacy practices in both English and their first language to dynamically create interdisciplinary identities communicable to different discourse communities. Their identities in different disciplines can develop simultaneously, rather than suppressing one for the development of the other as they do interdisciplinary research. Originality/value: This study first extends current scholarly discussion of disciplinary literacy to a less-investigated setting, i.e. doctoral education in higher education. Second, it adds an additive and current layer of interdisciplinarity to the existing understanding of international doctoral students' identity construction. Third, it helps to understand how the development of disciplinary literacy can facilitate disciplinary identity construction and how disciplinary identity construction can facilitate the development of disciplinary literacy.