A high voltage battery management apparatus for reducing consumption of wires, comprising: a plurality of battery packs (210, 220, 230) installed in a line and connected in series in a connecting direction, each of the battery packs including a plurality of unit cells; a plurality of slave battery management modules (201, 202, 203) connected to one another in series, respectively having a predetermined length in their length direction parallel with the connecting direction, respectively being installed integrally with a corresponding one of the plurality of battery packs in a detachable manner through fastening grooves, respectively being configured to measure and monitor a temperature or voltage of each of the unit cells included in each of the battery packs, thereby monitoring a state of each of the unit cells included in each of the battery packs, the plurality of unit cells included in each of the plurality of battery packs being stacked in two parallel lines in the connecting direction; a master battery management module having a predetermined length in its length direction parallel with the connecting direction, and being connected with a slave battery management module terminating the series connection of the plurality of slave battery management modules to receive respective cell voltage or temperature information of each of the battery packs through the terminating slave battery management module from each one of the plurality of slave battery management modules connected to one another in series, and to transmit respective cell balancing information through the terminating slave battery management module to each one of the plurality of slave battery management modules; and communication wires serially connecting the plurality of slave battery management modules with one another and the terminating slave battery management module with the master battery management module in the connecting direction; wherein the master battery management module is configured to receive information on all of the unit cells through the terminating slave battery management module by the communication wires. a plurality of battery packs (210, 220, 230) installed in a line and connected in series in a connecting direction, each of the battery packs including a plurality of unit cells; a plurality of slave battery management modules (201, 202, 203) connected to one another in series, respectively having a predetermined length in their length direction parallel with the connecting direction, respectively being installed integrally with a corresponding one of the plurality of battery packs in a detachable manner through fastening grooves, respectively being configured to measure and monitor a temperature or voltage of each of the unit cells included in each of the battery packs, thereby monitoring a state of each of the unit cells included in each of the battery packs, the plurality of unit cells included in each of the plurality of battery packs being stacked in two parallel lines in the connecting direction; a master battery management module having a predetermined length in its length direction parallel with the connecting direction, and being connected with a slave battery management module terminating the series connection of the plurality of slave battery management modules to receive respective cell voltage or temperature information of each of the battery packs through the terminating slave battery management module from each one of the plurality of slave battery management modules connected to one another in series, and to transmit respective cell balancing information through the terminating slave battery management module to each one of the plurality of slave battery management modules; and communication wires serially connecting the plurality of slave battery management modules with one another and the terminating slave battery management module with the master battery management module in the connecting direction; wherein the master battery management module is configured to receive information on all of the unit cells through the terminating slave battery management module by the communication wires.