An attenuation device for blue light includes a base and a blue light attenuating film system, the blue light attenuating film system including a film layer of first refractive index and a film layer of second refractive index alternately disposed on the same side of the base, a total number of the film layer of first refractive index and the film layer of second refractive index being 5 at least; wherein a film layer closest to the base and a film layer farthest from the base in the blue light attenuating film system are both the film layer of first refractive index, and the film layer of first refractive index has a refractive index greater than that of the film layer of second refractive index. A display device and a wearable product, as well as a preparation method of the attenuation device for blue light are further provided.