The invention discloses a battery transfer system. The battery transfer system comprises an upper computer sub system, a battery transfer platform, a robot sub system and a charging cabin sub system. An empty battery on the battery transfer platform is transferred to an empty cabin position in the charging cabin sub system, a full battery in a full charging cabin position in the charging cabin sub system is transferred to the battery transfer platform, and the robot sub system and the charging cabin sub system are controlled by the upper computer sub system, so that a battery transfer process is automatically finished by the battery transfer system.