A fallen undermount sink complete repair apparatus includes a wall bracket having at least one flange portion configured for fixedly fastening to a vertical wall and a second central portion generally perpendicular to said flange portion, with an aperture therethrough. Additionally, there is an expandable elonogated member pivotably attached at a proximal end to the wall bracket, and at the distal end of the elongated member is a sink bracket head portion generally perpendicular to that of the elongated member and configured to press against a portion of the underside rim of a detached sink.