The invention discloses a preparation method for an OLED insect-repelling lamp. According to the method, with an OLED, a light-emitting spectrum is controlled based on regulation of a blue-light emitting material, a green-light emitting material, a yellow-light emitting material and a red-light emitting material, so that the light-emitting wavebands are centralized to be at 530nm to 590nm and are at a red-light waveband. And the color rendering index of the OLED is larger than or equal to 65. The preparation method has the following advantages: firstly, the method is simple; with the OLED, the light-emitting spectrum can be controlled based on material regulation and the insect-repelling wavebands from 530nm to 590nm are highlighted in the spectrum, so that the insect-repelling effect is realized; secondly, illumination can be realized well; to be specific, because the light-emitting waveband includes a very few blue-light wavebands of 500nm below and also includes an appropriate number of red-light wavebands, so that the illumination effect is realized; and thirdly, the practicability of the method is high and the color temperature is low; and when the method is applied at night, the injury of the human eyes due to the blue light can be reduced and the suppression on melatonin secretion by the high-color-temperature illumination can be avoided.