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The working principle of vanadium redox flow batteries was introduced. According to the operational parameters and testing requirements of vanadium redox flow batteries, an automatic charging and discharging test system for capacity test of vanadium redox flow batteries was designed. The system is able to carry out constant voltage charge test, constant current charge test and constant current discharge test on vanadium redox flow batteries. It can monitor voltage of each battery in a battery stack and provide security protection in the test for the batteries and functions of saving and previewing data. Experimental results show that the designed system is able to fulfill capacity test of vanadium redox flow batteries. It would be an important reference to the study of vanadium batteries’ test system and the establishment of vanadium battery test standard.