Abstract: Diabetic cardiomyopathy (DCM) presents as myocardial fibrosis, left ventricular hypertrophy, and myocardial diastolic abnormalities. Cardiac magnetic resonance (CMR) technology can quickly and accurately determine the myocardial structure and cardiac function of diabetic patients and plays a crucial role in the diagnostic and prognostic evaluation of subclinical DCM. Evaluation of subclinical DCM using CMR technology primarily involves cardiac magnetic resonance-feature tracking (CMR-FT), magnetic resonance spectroscopy (MRS), T1 mapping technology, and magnetic resonance myocardial perfusion imaging. This paper reviews the research progress of CMR technology in the diagnosis of subclinical diabetic cardiomyopathy.