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Objective To study the effect of marein on the damage of rat myocardial cell line (H9c2) induced by high glucose. Methods H9c2 cells were divided into Ctrl group, high glucose (30 mmol/L) injury model group and marein (25, 50, 100 μmol/L) intervention group. The viability of H9c2 cells was detected by MTT method. Western blot was used to detect the protein expression level of LC-3Ⅱ/Ⅰ,p62 and mTOR. Results Compared with the Ctrl group, the viability of H9c2 cells in the model group was decreased (P＜ 0.01) and the viability of H9c2 cells in the marein group was significantly increased (P＜ 0.01). The protein expression of LC-3Ⅱ/Ⅰ in model group was decreased (P＜ 0.05) and the level of p62 and mTOR was increased (P＜ 0.01). The level of LC-3Ⅱ/Ⅰ in the marein group was increased, while the level of p62 and mTOR was decreased (P＜ 0.01). The protein expression was more obvious with the increase of concentration. Conclusions Marein can affect the expression of autophagy associated proteins in cardiomyocyte injury induced by high glucose.