Ulinastatin, a common adjuvant drug in the clinical treatment of acute circulatory failure, has a good effect on various inflammatory diseases. In this study, we aim to explore the clinical efficacy of ulinastatin combined with meglumine adenosine cyclophosphate in patients with acute myocardial infarction (AMI) and its effect on cardiac function and endothelial function of patients. 100 AMI patients treated in our hospital (February 2020-October 2020) were randomly chosen and divided into group J and group Q, with 50 cases in each group. Group Q was treated with meglumine adenosine cyclophosphate only, while group J was treated with ulinastatin combined with meglumine adenosine cyclophosphate to compare the treatment efficiency, cardiac structure indexes, cardiac systolic function, blood lipid levels, vascular endothelial function, QLI (quality of life) scores, BI indexes, and FMA (motor function) scores between the two groups. The treatment efficiency, QLI score, BI index, and FMA score in group J were notably higher compared with group Q (). The cardiac structure indexes, cardiac systolic function, blood lipid level, and vascular endothelial function in group J were notably better compared with group Q (). Ulinastatin combined with meglumine adenosine cyclophosphate can obviously enhance the therapeutic effect of AMI patients and improve the endothelial function and cardiac function of patients, which is very promising in this medical area.