The present invention discloses a distributed power battery pack monitoring device, comprising a charger or load interface, a DC power supply interface, a first inductor L1, a second inductor L2, a plurality of slave machines, a battery pack, a host, a DC power supply line DC+, and a DC power supply line DC-; wherein each slave machine comprises a third inductor L3, a fourth inductor L4, a first capacitor C1, a second capacitor C2, a slave machine power supply module, a slave machine microcontroller MCU, a terminal voltage acquisition module, a temperature acquisition module, an internal resistance measuring module, and a slave machine DC carrier module; the host comprises a fifth inductor L5, a sixth inductor L6, a third capacitor C3, a fourth capacitor C4, a host power supply module, a host microcontroller MCU, a total voltage acquisition module, a current acquisition module, a display module, and a host DC carrier module. The distributed power battery pack monitoring device of the present invention achieves information interaction between the host and the slave machines through carriers on the DC power supply lines, thereby saving the limited inner space of an automobile, and saving time and cost of periodic maintenance of the automobile.