Top-emitting OLED device and preparation method thereof

The invention provides a top-emitting OLED device and a preparation method thereof. The top-emitting OLED device includes a substrate, a reflective metal layer, an organic functional layer and a second electrode layer in sequence, a scattering layer and a transparent electrode layer are also arranged between the reflective metal layer and the organic functional layer, both sides of the scattering layer are in contact with the reflective metal layer and the transparent electrode layer, and the other side of the transparent electrode layer is in contact with the organic functional layer. According to the top-emitting OLED device provided by the invention, the scattering layer and the transparent electrode layer are arranged between the reflective metal layer and a luminous layer in sequence, and the scattering layer mainly eliminates a microcavity effect existing in a top-emitting device structure, thereby eliminating the problem of the visual angle of the device.