Abstract:〔Abstract〕 Objective To analyze and compare the effects of different anesthetics on myocardial oxidative damage in patients undergoing cardiac surgery. Methods 90 patients who underwent cardiac surgery from January 2020 to January 2021 in Xiamen Hospital of Traditional Chinese Medicine were selected. They were randomly divided into group M, group Q, and group B by lottery, with 30 cases in each group. Group M was anesthetized with midazolam, group Q was anesthetized with sevoflurane, and group B was anesthetized with propofol. The indicators of myocardial injury and oxidative stress in each group were analyzed. Results There was no significant difference in cardiac troponin I (cTnI), lactate dehydrogenase (LDH), phosphocreatine kinase isoenzyme (CK-MB), and creatine phosphate kinase (CK) among the three groups of patients before operation (T0) (P > 0.05). The cTnI, LDH, CK-MB and CK of the three groups of patients at T1 and T2 were all higher than T0, and the cTnI, LDH, CK-MB and CK of the Q group and B group at T1 and T2 were all lower than those of the M group (P < 0.05). There was no statistically significant difference in cTnI, LDH, CK-MB, CK in group Q and group B at T1 and T2 (P > 0.05); There was no statistically significant difference between superoxide dismutase (SOD) and malondialdehyde (MDA) among the three groups at T0 (P > 0.05). The SOD and MDA of the three groups of patients at T1 and T2 had significant changes. At T1, the MDA levels of Q and B groups were lower than those of M group, and SOD was significantly higher than that of M group. The difference was statistically significant (P < 0.05). There was no significant difference in MDA and SOD between Q and B groups at T1 and T2 (P > 0.05). Conclusion Compared with midazolam, sevoflurane or propofol anesthesia for cardiac surgery patients can effectively inhibit oxidative stress and reduce myocardial damage.