In order to improve the fire retardant properties of light-cured acrylate coatings，hyperbranched silicon-containing resin（HBPSi）was synthesized by the condensation reaction of KH-570 with water，and hyperbranched fire retardant prepolymer（SMASi）with ultraviolet（UV）curing function was prepared by the reaction of HBPSi and the half adduct （HEA-TDI） from hydroxyethyl acrylate and toluene diisocyanate，then the coatings were prepared by UV curing method based on SMASi，ZnCl2 and EA as composite raw material. The structure of the product was detected and analysized by Fourier transform infrared spectroscopy，and visible light transmittance of the coatings were determined by UV-Visspectrophotometer，and its fire retardant and thermal stability property was characterized bylimiting oxygen index tester，thermogravimetry，vertical burning tester，cone calorimetry. The results showed that the light transmittance，char yield and water resistance of the coating could be improved，when SMASi was added to the ZnCl₂/EA system. When the dosage of SMASi was 10%，the char yield，LOI，vertical burning level and heat release rate was the best respectively， which corresponded to 50. 0%，48，V-0 and 209 KW/m². It could significantly reduce the heat release rate of the coating，and effectively improve its fire retardant properties. The coatingprepared in this experiment could meet the requirements of transparent intumescent fireretardant coating，and it had a good application prospect in the field of fire retardant of wooden cultural relics，furniture and ancient buildings.