A bus bar assembly for a multiple input power distribution shelf to be installed in a server rack provided with rack bus bar, whereby the shelf includes a plurality of power supply units each having a first power output electrode and a second power output electrode, said bus bar assembly comprising: a first linking bus bar comprising a first main bar, plural first bending parts and at least one first output part, wherein the first bending part and the at least one first output part are connected to two opposite sides of the first main bar respectively, and the plural first bending parts are separated apart with each other at a specific interval; a second linking bus bar corresponding to the first linking bus bar and comprising a second main bar, plural second bending parts and at least one second output part, wherein the second bending part and the at least one second output part are connected to two opposite sides of the second main bar respectively, and the plural second bending parts are separated apart with each other at a specific interval; an insulation member disposed between the first main bar and the second main bar, wherein the first main bar and the second main bar are insulated with each other by the insulation member; whereby the first main bar is disposed over the second main bar and said main bars are insulated with each other by the insulation member, whereby the first bending parts and the second bending parts are staggered and arranged at the same plane, a first bending part being disposed between any two neighboring second bending parts, and a second bending part being disposed between any two neighboring first bending parts, whereby the first output part is vertical to the first main bar, and the second output part is vertical to the second main bar, whereby the first output part and the second output part are separated apart with each other at a specific interval and form a gap therebetween, whereby the gap is configured to clipt the rack bus bar, and plural input power connectors mounted on the plural first bending parts and the plural second bending parts, whereby the clip-type power connectors are arranged on the same plane and alighned for mating with said power output electrodes (42, 43) of the power supply units respectively and correspondingly, wherein the first output part of the first linking bus bar comprises plural first holes, the second output part of the second linking bus bar comprises plural second holes corresponding to the first holes respectively, whereby the first holes and the second holes are configured to allow the rack bus bar of the server rack to be securely mounted in said gap, such that the DC output power outputted by the power supply unit via the first power output electrode and the second power output electrode can be transferred to the rack bus bar. a first linking bus bar comprising a first main bar, plural first bending parts and at least one first output part, wherein the first bending part and the at least one first output part are connected to two opposite sides of the first main bar respectively, and the plural first bending parts are separated apart with each other at a specific interval; a second linking bus bar corresponding to the first linking bus bar and comprising a second main bar, plural second bending parts and at least one second output part, wherein the second bending part and the at least one second output part are connected to two opposite sides of the second main bar respectively, and the plural second bending parts are separated apart with each other at a specific interval; an insulation member disposed between the first main bar and the second main bar, wherein the first main bar and the second main bar are insulated with each other by the insulation member; whereby the first main bar is disposed over the second main bar and said main bars are insulated with each other by the insulation member, whereby the first bending parts and the second bending parts are staggered and arranged at the same plane, a first bending part being disposed between any two neighboring second bending parts, and a second bending part being disposed between any two neighboring first bending parts, whereby the first output part is vertical to the first main bar, and the second output part is vertical to the second main bar, whereby the first output part and the second output part are separated apart with each other at a specific interval and form a gap therebetween, whereby the gap is configured to clipt the rack bus bar, and plural input power connectors mounted on the plural first bending parts and the plural second bending parts, whereby the clip-type power connectors are arranged on the same plane and alighned for mating with said power output electrodes (42, 43) of the power supply units respectively and correspondingly, wherein the first output part of the first linking bus bar comprises plural first holes, the second output part of the second linking bus bar comprises plural second holes corresponding to the first holes respectively, whereby the first holes and the second holes are configured to allow the rack bus bar of the server rack to be securely mounted in said gap, such that the DC output power outputted by the power supply unit via the first power output electrode and the second power output electrode can be transferred to the rack bus bar.