Ablative wave-transparent coatings play an important role in the thermal protection of the new generation of aircraft antenna windows.However，the application of the existing wave-transparent coatings was limited by their lack of thermal protection performance，adaptability to aerothermal environment and inability to vulacnize at room temperature.To address this issue，a lightweight wave-transparent and ablative thermal protection coating vulacnized at room temperature was developed in this paper.Using silicone resin as matrix and hexagonal boron nitride （h-BN） as porcelain filler，a new coating material was prepared by changing the proportion of h-BN.The effects of h-BN on the phase composition，thermal stability，mechanical properties and wave-transparent properties of the coatings were investigated by X-ray diffraction （XRD），scanning electron microscope （SEM），thermogravimetric analysis （TG），universal testing machine and arc wind tunnel， respectively.The results show that the addition of 12 phr h-BN greatly improves the structural stability of the coating at high temperature and significantly improves the comprehensive properties of the coating.The density of the obtained coating is about 0.63 g/cm³，the elongation at break is 20% to 30%，and dielectric loss tangent is less than 0.025.It has the advantages of light weight，strong toughness and low dielectric，and can achieve the requirements of ablation，thermal protection and wave-transparent in the thermal environment with megawatt high heat flux and surface temperature above 1 200 ℃.