The invention provides a photoelectric co-packaging structure and a preparation method thereof, and the method comprises the steps: a device layer in a provided
silicon optical
wafer at least comprises a device region which is provided with an optical port and a first bonding pad; a leading-out column penetrating through a device area is formed, a first
interconnection layer electrically connected with a first bonding pad and the leading-out column is formed on the face, away from a substrate layer, of a device layer, then an electric
chip is bonded to the face, away from the device area, of the first
interconnection layer, and a second bonding pad exposed out of the electric
chip is electrically connected with the first
interconnection layer. The substrate layer is removed to
expose the leading-out columns and electrically connected with the second interconnection layer through the leading-out columns, the
silicon optical
wafer is divided to obtain a
chip structure comprising a single device area and a light outlet exposed on the side wall, and after the face, away from the device area, of the second interconnection layer is electrically connected with the substrate, the
optical fiber array is optically interconnected with the light outlet. The obtained photoelectric co-packaging structure is high in
interconnection density, low in interconnection loss, small in size and high in reliability, the production efficiency is improved, and the production cost is effectively reduced.