The present invention relates to a high-efficiency circuit-equipped light emitting board, which is made so as to be usable as advertisement boards and signs, and can be used either indoor ones or outdoor ones. The light emitting board includes inner and outer frames, a display board, light emitting diodes, and a driving circuit for making the light emitting diodes to produce light. The display board allows light to travel through it, and has words, patterns, characters, drawings or signs adhered thereto. The display board is disposed between the frames in such a way that users can easily substitute it with a different one. And, the present board is watertight.