Myocardial injury after noncardiac surgery (MINS) is closely related to postoperative cardiovascular complications and mortality in short time after surgery, but its clinical manifestations are not typical. The sensitivity or specificity of routine examination is poor, thus delayed diagnosis or even misdiagnosis may happen. Thus, the clinical significance of early diagnosis of MINS is high. By understanding the pathogenesis, clinical manifestations and diagnostic criteria of MINS, our review enhances concerns on MINS and promotes diagnosing MINS in time for improving the prognosis of patients. The research advances of MINS, especially the related research on the diagnosis of MINS and the prognostic value of high‑sensitivity cardiac troponin T (hs‑cTnT), were reviewed. The value of hs‑cTnT in the diagnosis of MINS and its prognostic value will be further emphasized and studied, which provides clinicians with timely, reliable and credible laboratory test results so that it provide more guidance for reducing cardiovascular complications and mortality in non‑cardiac surgery.