Abstract: Objective To investigate the expression and clinical significance of microRNA-93-5p (miR-93-5p) in patients with type 2 diabetes mellitus (T2DM) complicated with coronary heart disease (CHD). Methods A total of 60 patients with T2DM (T2DM group), 57 patients with T2DM complicated with CHD (T2DM with CHD group), and 60 healthy individuals (control group) were enrolled in this study from August 2019 to May 2021. The general information, serum miR-93-5p, and interleukin-6 (IL-6) levels were compared among the T2DM with CHD group, control group and T2DM group; the relationships of serum miR-93-5p and IL-6 levels with low-density lipoprotein cholesterol (LDL-C), fasting insulin (FINS), high-density lipoprotein cholesterol (HDL-C), fasting blood glucose (FBG), triglyceride (TG), glycated hemoglobin (HbA1c), and total cholesterol (TC) were analyzed in T2DM with CHD patients; the influencing factors of T2DM complicated with CHD were analyzed; the predictive value of serum miR-93-5p and IL-6 for T2DM complicated with CHD was evaluated. Results The levels of LDL-C, FINS, TG, FPG, TC, HbA1c, serum miR-93-5p, and IL-6 in the T2DM with CHD group and T2DM group were significantly higher than those in the control group, while the HDL-C level was significantly lower (P<0.01); the levels of LDL-C, FINS, TG, FPG, TC, HbA1c, serum miR-93-5p, and IL-6 in the T2DM with CHD group were significantly higher than those in the T2DM group, while the HDL-C level was significantly lower (P<0.01). The serum miR-93-5p and IL-6 levels in T2DM with CHD patients were positively correlated with LDL-C, FINS, HbA1c, TC and FPG (P<0.01), and negatively correlated with HDL-C (P<0.01); the expression level of miR-93-5p in serum was positively correlated with IL-6 (P<0.05). LDL-C, FINS, FPG, HbA1c, TC, miR-93-5p, and IL-6 were the influencing factors of T2DM complicated with CHD (P<0.05); the area under the curve (AUC) of serum miR-93-5p and IL-6 for predicting T2DM complicated with CHD was 0.888 and 0.898 respectively, with cut-off values of 2.59 and 77.98 ng/L respectively, sensitivity of 75.4% for both serum miR-93-5p and IL-6, and the specificity was 89.2% for miR-93-5p and 85.8% for IL-6; the AUC of the combined prediction of miR-93-5p and IL-6 for T2DM complicated with CHD was 0.939, with sensitivity and specificity of 91.2% and 83.3% respectively. Conclusion The serum miR-93-5p level is elevated in patients with T2DM complicated with CHD, and miR-93-5p together with IL-6 may participate in the process of T2DM complicated with CHD. The combined detection of IL-6 and miR-93-5p is expected to serve as an auxiliary method for prediction of T2DM complicated with CHD.