A server cabinet includes a cabinet body having a side plate, a door pivotably coupled to a front side of the side plate, a power distribution unit mounted in the cabinet body, and a plurality of power supply units attached to an inner side of the door. The power supply units are electrically coupled with the power distribution unit and configured to be electrically coupled with a plurality of servers through a plurality of cables, the power supply units being detachable and replaceable in spite of minimal physical access through the partly-closed door.