The present disclosure provides an organic light-emitting diode packaging structure, a method for packaging an organic light-emitting diode and a display device. The packaging structure includes: a display area of an organic light-emitting diode arranged on a substrate; a cathode pattern arranged on the display area; a first inorganic blocking layer arranged on the cathode pattern; an organic buffer layer arranged on the first inorganic blocking layer, wherein the organic buffer layer is electrically connected at its edge to the cathode pattern in a peripheral area of the display area; and a second inorganic blocking layer, wherein the second inorganic blocking layer is connected directly at its edge to the substrate in the peripheral area of the display area, so as to cover all the other layers.