Objective To evaluate the synergistic effect of Yinzhihuang oral liquid on blue light irradiation combined with Saccharomyces boulardii powder in the treatment of neonatal jaundice.Methods The data of children with neonatal jaundice admitted to Yiwu Central Hospital from January 2022 to January 2024 were retrospectively analyzed.Patients were divided into the experimental group and the control group according to the treatment plans.The myocardial function[creatine kinase isoenzyme(CK-MB),creatine kinase(CK)and cardiac troponin Ⅰ(cTnⅠ)],blood gas indexes[partial pressure of oxygen(PaO2),partial pressure of carbon dioxide(PaCO2)and pH value],symptom improvement,efficacy and incidence of adverse reactions were compared between the two groups.Results A total of 180 children were included in the study,with 90 in each group.The effective rate of the experimental group was higher than that of the control group,and the incidence of adverse reactions was lower than that of the control group(P＜0.05).After treatment,the levels of CK,CK-MB,cTnⅠ and PaCO2 in the two groups were lower than those before treatment,and the experimental group was lower than the control group(P＜0.05);the levels of pH and PaO2 in the two groups increased,and the experimental group was higher than the control group(P＜0.05).The improvement time of each symptom and the number of bowel movements per day in the experimental group were smaller than that in the control group(P＜0.05).Conclusion Yinzhihuang oral liquid combined with Saccharomyces boulardii powder can effectively improve the myocardial function,regulate blood gas,improve the curative effect of children with neonatal jaundice,and is with good safety.