The invention relates to a portable battery management device for a reader-writer of a responder. The portable battery management device comprises a shell and a battery management circuit in the shell. The battery management circuit comprises a charge and discharge control unit, a redundancy temperature protection unit and a voltage conversion unit, the charge and discharge control unit is provided with an external power interface and a battery interface, the external power interface is used for being connected with external charge power sources, the battery interface is used for being connected with batteries of the reader-writer of the responder, the charge and discharge control unit is further connected to the voltage conversion unit by the redundancy temperature protection unit, the voltage conversion unit is provided with a 5V voltage output end, and the 5V voltage output end is connected to internal working circuits of the reader-writer of the responder. Compared with the prior art, the portable battery management device has the advantages of small size, portability, high output currents and the like.