The invention discloses a coating device for a fogdrop prevention solution and a coating method thereof. The coating device for the fogdrop prevention solution comprises a baking oven A, a baking oven B, an upper compression roller, a lower coating roller, an extrusion roller and a liquid tank, wherein a row of infrared emission tubes are mounted at the lower part of the baking oven A; the baking oven A and the baking oven B are arranged side by side; the infrared emission tubes are respectively arranged above and below the baking oven B; the fogdrop prevention solution is accommodated in the liquid tank; the lower coating roller is mounted right above the liquid tank; the lower coating roller is partially immersed into the fogdrop prevention solution; the upper compression roller is mounted right above the lower coating roller; the extrusion roller is mounted on the right side of the lower coating roller; the center of the extrusion roller and the center of the lower coating roller are on the same plane. A fogdrop prevention coating can be completely cured better, the surface tension of condensate water is increased, a water film is formed by the condensate water, the condensate water drains outdoors gradiently, and the adhesive force is high, so that the coating is unlikely to be damaged and can be used for more than ten years in a natural environment.