The present invention discloses a molecular peroxide mimic enzyme and its preparation method and application, belonging to the field of chemical detection technology. The molecular peroxide mimic enzyme is a 5-NQ-Fe complex. The preparation method comprises the following steps : adding TMB, H2O2, 5-NQ, Fe3 + and tartaric acid to a NaAc-HAc buffer with a concentration of 0.1 M and a pH of 4.0. The final concentrations of TMB, H2O2, 5-NQ, Fe3 + and tartaric acid are 0.1 mM, 1mM, 0.01-20μM, 10μM, and 100μM, respectively. The whole system is reacted at 20 °C for 10min. The molecular peroxide mimetic enzyme can be used to detect beta-galactosidase and human IgG. The beneficial effect of the present invention is that the 5-NQ-Fe complex has a catalytic effect on TMB, has the properties of HRP mimic enzyme, and is a molecular peroxide mimic enzyme.
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