An OLED element and a method of manufacturing thereof are provided. The method of manufacturing OLED element includes step S1, sequentially depositing a hole injection layer, a hole transport layer, an emission layer, an electron transport layer and an electron injection layer and a first cathode on an anode; step S2, forming sub-pixels corresponding to each of the emission layers and an organic material layer for adjusting microcavity effect by photolithography; step S3, depositing a second cathode on the organic material layer. The disclosure provides a manufacture which adds conducting organic material layer between two cathodes by photolithography which is not effect to OLED material. According to adjust thickness of layer to enhance microcavity effect, the photolithography is different than the photolithography of manufacture CF and anode, it doesn't need fine metal mask, which save cost and time of manufacture OLED and enhance process efficiency.