Power distribution device, power distribution system, and maintenance or replacement method for power distribution device

The embodiment of the invention provides a power distribution device, a power distribution system and a maintenance or replacement method of the power distribution device. The power distribution device comprises a cabinet body, wherein the cabinet body is internally divided into an equipment compartment, a bus compartment and a functional unit compartment; uPS equipment is arranged in the equipment compartment, and the UPS equipment is provided with an input end and an output end; a power distribution input bus and a power distribution output bus are arranged in the bus compartment; the functional unit compartment is internally provided with a functional device, and the functional device comprises a UPS input switch and a UPS output switch; a vertical bus area is divided in the equipment compartment, a vertical bus is arranged in the vertical bus area, and the input end of the UPS equipment is connected with the power distribution input bus through the vertical bus and the UPS input switch; and the output end