The present disclosure relates to an organic light emitting device, which includes: a cover plate, a substrate and an organic light emitting diode. The cover plate has a carbon nanotube layer thereon. The organic light emitting diode and the substrate are packaged on the cover plate by adhesive applied around the carbon nanotube layer. The organic light emitting display device provided by the present disclosure has a good packaging effect, a good tightness and a good heat dissipation performance.