The utility model discloses a battery performance consistence testing system comprising a monitoring terminal and a detection cabinet. The detection cabinet includes a battery pack string detection device, a well pattern converter communication module, a well pattern converter, a battery management system communication module, a battery management system and a battery pack string. The battery pack string is respectively connected with the battery management system, the well pattern converter, and the battery pack string detection device; the battery pack string detection device that is connected with the monitoring terminal by a CAN bus is used for obtaining a working state parameter of the battery pack string; the well pattern converter that is connected with the well pattern converter communication module by a CAN bus is used for charging and discharging the battery pack string; the battery management system that is connected with the battery management system communication module by a CAN bus is used for obtaining working state data of a single battery in the battery pack string; and the monitoring terminal that is connected with the well pattern converter communication module, the battery management system communication module and the battery pack string detection device by a CAN bus is used for generating a battery performance consistence testing result according to the working state parameter of the battery pack string and the working state data of the single battery.