Abstract: As a new multimodal imaging technology, PET/MR combines the ability of MRI and its various functional imaging parameters to obtain excellent and highly sensitive soft tissue contrast and the capability of PET to quantify radiotracer metabolism. Via simultaneous scanning, this combined method achieves PET images and allows the examination of fine anatomical structures through MRI. The effectiveness of this combined method is increasingly explored in diagnosing cardiovascular diseases. This review summarizes the advantages and limitations of PET/MR in diagnosing cardiovascular diseases and discusses its potential clinical applications.