An optical communication device includes a light emitting element including a light emitting surface, a processor, a first controller electrically connected to the light emitting element and electrically connected to the processor, a light receiving element including a light receiving surface, a storing element, a second controller electrically connected to the light receiving element and electrically connected to the storing element, a first coating element coating the light emitting element, the first controller, the processor, the light receiving element, the second controller, and the storing element, a planar optical waveguide, and two reflecting elements. The first coating element includes a supporting surface. The supporting surface defines two light guiding holes. The planar optical waveguide is positioned on the supporting surface, and defines two through holes. Each through hole spatially corresponds to and communicates with a light guiding hole. Each reflecting element is received in a through hole.