DIZE improved obesity and metabolic disturbances in DIO mice. An increase of sperm account and motility, along with improved morphology and increased male fertility was observed after DIZE treatment. Both serum and intratesticular testosterone levels showed an increase. Moreover, ACE2/Ang 1-7/MasR protein levels in the testes were restored, which inhibited germ cells apoptosis, lipid accumulation, and oxidative stress, and elevated testosterone synthesis-related proteins. However, the MasR antagonist A779 partially counteracted the improving effects of DIZE on metabolism and the testes of DIO mice. Conclusion: DIZE treatment has protective effects against obesity-induced testicular injury by activating ACE2/Ang 1-7/MasR axis.