Highly-thermally-conductive water-soluble photodiffusion coating as well as preparation method of the coating and preparation method of coating layer

The invention relates to a highly-thermally-conductive water-soluble photodiffusion coating as well as a preparation method of the coating and a preparation method of a coating layer and belongs to the technical field of photology. The coating is characterized by comprising the following components in percentage by weight: 40-50% of water-based polyacrylate resin, 15-25% of nanometer calcium carbonate, 5-15% of nanometer alumina, 0.2-0.8% of dispersant, 0.2-0.8% of defoamer and 20-30% of deionized water. By virtue of the highly-thermally-conductive water-soluble photodiffusion coating as well as the preparation method of the coating and the preparation method of the coating layer, the problems of dazzle, light pollution and the like of the LED light are solved, the light source of the LED light is uniform, soft and full, the coating has the advantages of good light transmittance, light scattering property and heat dissipation effect and long service life; and the preparation method is simple and convenient.