In order to avoid the droplets staying and freezing on the surface of aircraft, and ensure the safe flight of aircraft in ice and snow weather, the superhydrophobic composite coating was prepared on the surface of AMS 4037 aluminum alloy, and its hydrophobicity was studied. Using styrene-ethylene-butylene-styrene block copolymer (SEBS) and hydrophobic silica (h-SiO2) as raw materials, SEBS/h-SiO2 superhydrophobic composite coating was prepared on aluminum alloy by dip-coating method. The microstructure, functional group, roughness and contact angle of the coating were characterized by scanning electron microscope, infrared spectrometer, laser confocal microscopy and contact angle tester. When the mass ratio of SEBS to h-SiO2 is 1∶3, the surface roughness of the coating is 1.11 μm, and the hydrophobicity of the coating is best, in which the static contact angle with water is more than 160°, and the rolling angle is less than 1°. Many micro/nanostructure with a size of 10 μm is distributed on the coating surface. According to Cassie model analysis, the water contact area of the coating is 12%, and 88% of the air is trapped. Through the stability test, the high hydrophobicity can be maintained within 120 min after continuous immersion in water. The SEBS/h-SiO2 composite coating has a binary micro/nano rough structure, along with the low surface energy of SEBS and h-SiO2. The air cushion is formed when the droplets are contacted with coating, resulting in excellent superhydrophobic properties. At the same time, the coating shows good stability and self-cleaning ability similar to a lotus leaf.