The invention discloses an OLED component and a preparation method thereof and a displayer. The OLED component comprises a white-light OLED and a color filter film so that R sub pixels, G sub pixels, B sub pixels and W sub pixels can be formed. The OLED component is characterized in that identical optical resonance layers are arranged between the area, corresponding to the W sub pixels, of the white-light OLED and the color filter film and between the area corresponding to one pixel, adjacent to the W sub pixels, of the R sub pixels, the G sub pixels and the B sub pixels and the color filter film, and each optical resonance layer is composed of at least two layers of media, wherein the refractive index of the first medium layer close to the color filter film is higher than that of the second medium layer close to the white-light OLED. According to the OLED component, the characteristic of the white light spectrum is utilized, the optical resonance layers are shared with other sub pixels, power consumption is lowered greatly, the optical distance can be adjusted through the thickness of a low refraction index layer, the FMM is not needed when preparation is carried out, and process cost is reduced.