This paper presents a narrative study on the professional identity development of a Chinese preservice EFL teacher, examining her experiences before, during, and after the teaching practicum. The data for this research were gathered through in-depth interviews, documents, and observations. By offering a comprehensive narrative of Yang’s practicum journey, this study sheds light on the evolving nature of professional identity among Chinese preservice EFL teachers. Through the framework of teacher socialization, the findings reveal distinct phases in Yang’s professional identity. Yang’s stories highlight the dynamic and evolving process of professional identity development, characterized by continuous negotiation, adjustment, and reflection at each stage of the practicum. Additionally, this paper offers practical recommendations for educational institutions, placement schools, and preservice teachers. By integrating these findings, future teacher education programs can better prepare aspiring educators to navigate the complexities of professional identity development, thereby enhancing the effectiveness of EFL teacher training in China.