In order to investigate the effect of flame-retardant fillers on the properties of ceramicized refractory silicone rubber, ceramicized refractory silicone rubber was prepared with silicon rubber as the base material, zinc borate and glass powder as the ceramic filler, and different proportions of magnesium hydroxide and aluminum hydroxide as the flame retardant fillers. The hardness, tensile property, tear property, electrical insulation property and fire resistance of ceramicized silicone rubber were tested and analyzed. The results showed that the Shore hardness of ceramicized silicone rubber was increased by 26.3% compared with that of conventional silicone rubber. The tensile properties reduced by different degrees, but the tensile properties could still meet the requirements of wire and cable product standards. The maximum increase of tearing property was 74%. Electrical insulation performance had a certain degree decrease. Ceramic silicone rubber had good fire resistance, with the same mass fraction of flame retardant, magnesium hydroxide was more beneficial to the improvement of flame retardant resistance for ceramic silicone rubber than aluminum hydroxide, its limiting oxygen index was 41.1% higher than that of conventional silicone rubber.