A shelving system having a detached power supply apparatus includes at least a hollow vertical shelf rail, at least a bus bar inserted into the vertical shelf rail, and at least a detached power supply apparatus inserted in the vertical shelf rail and electrically connected to the bus bar. Each of the vertical shelf rails includes at least a punched hole, and two locating protrudes. Each of the bus bar includes a slot, and two current conductors. The slot includes a carrier surface, and a track abutting surface. Each of the detached power supply apparatus passes through the punched hole and is inserted between the carrier surface and the track abutting surface. Each of the detached power supply apparatus includes two push-in resilient ball head plungers, a receiving surface, an abutting surface, and two reeds. The abutting surface is engaging with the track abutting surface.