This study aimed to investigate the current status of mental health literacy and related influencing factors in patients with coronary heart disease. Four hundred and thirty‐five patients with coronary heart disease were recruited in this survey. Data collection was conducted using the General Information Questionnaire, the Chinese version of the Mental Health Literacy Scale, Coronary Artery Disease Self‐Management Scale, Social Support Rating Scale, and Coronary Heart Disease Self‐Efficacy Scale. Descriptive methods, independent samples t‐test or one‐way ANOVA, Pearson's correlation analysis, and multiple linear regression were used for data analysis. The results showed that the mean total mental health literacy score of patients with coronary heart disease was 96.42 ± 8.40; gender, age, education level, monthly per capita family income, first diagnosed with coronary heart disease, cardiac function classification, self‐management ability, social support, and self‐efficacy were the factors influencing the level of mental health literacy in patients with coronary heart disease (all p < 0.05). The study suggests that mental health literacy can improve patients' self‐management ability and self‐efficacy, and healthcare professionals should emphasize the strengthening of this aspect of health education in order to better improve patient's prognosis.