The invention discloses an optical module packaging structure including a switching plate, an optical chip, and a flexible plate, the switching plate has a top surface, a bottom surface opposite to the top surface, and a first through hole penetrating the top surface and the bottom surface, and the top surface of the switching plate has a re-wiring structure and one or more first pads, the optical chip is arranged on the top surface of the switching plate and opposite to the first through hole, the flexible plate has a first surface, a second surface opposite to the first surface, a re-wiring layer and a second pad that are arranged on the first surface, a re-wiring layer and an output pad that are arranged on the second surface, a conductive through hole penetrating through the flexible plate to form the electrical connection between the first surface and the second surface, wherein the flexible plate can bend, and at least one first pad at the top of the switching plate is electrically connected to the second pad on the first surface of the flexible plate. According to the invention, the optical module socket is perpendicular to the chip through the flexible board, so that the vertical wiring can be prevented.