The present disclosure relates to a digital X-ray detector, which includes a base substrate; a metal layer disposed on a bottom face of the base substrate; an elements-array disposed on a top face of the base substrate; a ground electrode disposed on a top face of the base substrate and electrically connected to the elements-array; a scintillator layer disposed on the elements-array; and a reflective plate disposed on the scintillator layer. Thus, a static-electricity discharge path along which static-electricity from the reflective plate moves through the ground electrode to the metal layer may be secured. This may increase or maximize an effective ground region, such that the static-electricity generated from the top and bottom of the digital X-ray detector can be more efficiently discharged out.