A miniature photoelectric composite cable for high-definition video signal transmission includes a flat optical fiber component and a round electrical component. The flat optical fiber component includes a multi-core optical fiber, a strengthening layer, and a light jacket. The round electrical component includes a multi-core electrical cable, a cladding, and an electric jacket. The cladding covers outside the multi-core electrical cable. The optical fiber component and the electrical component are arranged side-by-side.