This study aimed to examine the relationship between the classroom environment (CE) and university identification (UI) and the chain mediating effects of student engagement and academic achievement (AA). 4,463 Chinese university students were assessed using the classroom environment and UI scales, and measures of student engagement. Results show: (1) a significant positive correlation between a supportive CE, high student engagement, high AA, and high UI; (2) AA plays a mediating role between CE and UI, while student engagement mediates CE and UI; and (3) student engagement and AA play a chain mediating role between CE and UI. This study verified that a positive CE helps strengthen university students' UI, and student engagement, AA, and a series of intermediary roles had a chain mediating effect. Universities should create a positive CE and encourage building good interpersonal relationships between students and others to further increase AA and UI among students. How classroom environment impact on university identification?Purpose This study aimed to examine the relationship between the classroom environment (CE) and university identification (UI), and the chain mediating effects of student engagement and academic achievement (AA). Methods 4,463 Chinese university students were assessed using Hayes SPSS PROCESS macro (Model 5) to test all hypotheses . Conclusions The finding indicate: (1) a significant positive correlation between a supportive CE, high student engagement, high AA, and high UI; (2) AA plays a mediating role between CE and UI while student engagement mediates CE and UI; and (3) student engagement and AA play a chain mediating role between CE and UI. Therefore, CE directly affects students' UI while indirectly affecting UI levels through the chain intermediary role of student engagement and AA. Implications This study illustrated the process of how CE influences students' UI. The indirect path (CE-student engagement--AA--UI) is significant and UI is highly sensitive to the positive impact of CE. Thus, administrators in public universities should emphasize factors such as identification and sense of belonging experienced by students within these institutions. limitations of your study The regional differences of the small sample size used, restricting the generalizability of the study results.