The work aims to study the factors affecting the hydrophobicity of silicone rubber coatings and find out the corresponding improvement method. With liquid silicone rubber as the matrix, the superhydrophobic surface coatings were prepared in three different ways of burning rubber strips, adding nano-SiO2 powder, and spraying nano-SiO2 powder. The optimum conditions for hydrophobicity were studied by changing the way in which the nano-powder was added and the quality of the addition. The surface hydrophobic properties were evaluated by measuring the static contact angle with optical microscopy, and the factors affecting the hydrophobicity were obtained. The best method was that the burning smoke was attached to the surface of the liquid silicone rubber coating. Most of the test samples had super-hydrophobic properties. The static contact angle was up to 159°, the average value was 150°, and the static contact angle was increased by 40°. The second was the nano-SiO2 powder sprayed evenly. Some test samples showed super-hydrophobic properties. The static contact angle was up to 145°, the average value was 135.5°, and the static contact angle was increased by 30° to 40°. The effect of simple agitation and mixing was the worst. There was no super-hydrophobic property in the test sample. The static contact angle was up to 124°, the average value was 108.5°, and the static contact angle was only increased by 5° to 15°. The key to constructing a super-hydrophobic coating is whether the secondary microstructure of micro-nano can be successfully constructed. Simple physical mixing and stirring will cause the nano-powder to be covered and fail to exhibit the characteristics. The hydrophobic ability of the coating is related to the actual microscopic length around the contact.