Silicon dioxide inkjet adsorbent is the adsorbent material in the surface coating of color inkjet substrates, and the coating is the carrier of color ink. When printing, after the ink is sprayed onto the surface of the paper by the ink head, the moisture in it is quickly absorbed and penetrated into the coating. At the same time, the silica inkjet adsorbent in the coating can quickly absorb the moisture, ensuring that the dye in the ink droplets does not diffuse or bleed, the ink droplets are smooth, the edges are clear, and the final image effect is realistic, with high resolution and bright colors.