The present invention relates to the technical field of display, and discloses an organic electroluminescent device, a manufacture method thereof and a display device. The organic electroluminescent device comprises a substrate, one side of the substrate is provided with a pixel defining layer, a metal conductive layer, a light emitting layer and a cathode layer, the projection of the metal conductive layer on the substrate does not overlap with the projection of a pixel unit on the substrate, and the metal conductive layer is electrically connected with the cathode layer. In the abovementioned organic electroluminescent device, the metal conductive layer electrically connected with the cathode layer is arranged in a non-luminescent region, and the metal conductive layer is electrically connected with the cathode layer, so that the parallel connection between the metal conductive layer and the cathode layer is realized, the resistance of the cathode layer is reduced, the effect of reducing the voltage drop of the cathode layer is achieved, and the uniformity of the display brightness of the display panel and the display quality of the display panel are improved.