The invention relates to the technical field of photoelectric devices, and discloses an optical engine packaging structure and a preparation method thereof. The structure comprises an adapter plate structure, an electrical module, a first rewiring layer, an
optical module and a packaging substrate, a containing space of the adapter plate structure comprises at least part of the thickness of the adapter plate structure, and a conductive structure is arranged in a penetrating mode in the thickness direction; the electrical module is arranged in the accommodating space and the front surface of the electrical module is exposed; the first
redistribution layer is arranged on the adapter plate structure and is electrically communicated with the conductive structure and the electrical module; the
optical module is arranged on the first rewiring layer, the front side faces the first rewiring layer, and an optical port is exposed to the external space and connected with an external optical device; the packaging substrate is arranged on the back surface of the adapter plate structure and is suitable for being electrically connected with the electrical module. According to the invention, the
optical module is stacked on the electrical module, so that the warping is reduced, the
signal transmission is improved, the packaging size is reduced, and the process is simple.