In order to eliminate the adverse effects of low-temperature icing on the surfaces of aerospace vehicles, power transmission cables, wind turbine blades, etc., and to enhance the self-cleaning capability of the absorbing coatings on the surfaces of aerospace vehicles, modified hierarchical SiO₂/PU superhydrophobic coating was produced by compounding nano-silicon dioxide (n-SiO₂) and micron-silicon dioxide (m-SiO₂) fillers modified by silane coupling agent with polyurethane (PU) matrix in a 6∶1 mass ratio. The results show that the better dispersion of m-SiO₂ in the PU matrix improves the stability of the coating and effectively eliminates the cracking of the coating due to the agglomeration of n-SiO₂. The n-SiO2 and m-SiO₂ fillers work together on the surface of the coating to build up a dense hierarchical micro-bulge hydrophobic structure, which can trap more air to increase the air–liquid contact area of water droplets. The water contact angle of the hierarchical modified SiO₂/PU superhydrophobic coating can reach 158.56°±1.08° and has good self-cleaning ability and wear resistance. In addition, the excellent wavetransparent property of the hierarchical modified SiO₂/PU superhydrophobic coating does not adversely affect the performance of the absorbing coating. It is shown that the prepared hierarchical modified SiO₂/PU superhydrophobic coating is an ideal protective coating for wave-absorbing materials.