Abstract: Ceramic silicone rubber fire-resistant cable is a new flame retardant material applied in the electrical field, which will form a stable, dense and flame retardant ceramic layer to protect the internal core and material when being heating. Cone calorimeter, thermogravimetric analysis (TG) and heat insulation property test were used to analyze the combustion performance and pyrolysis characteristics of sample, by combining muffle furnace and Fourier transform infrared spectroscopy (FTIR) to study the ceramic layer evolution characteristics. The results demonstrate that the ceramization process of ceramic silicone rubber-based cable can be divided into three stages,namely the initial decomposition stage, the initial ceramicization stage and the ceramicization stability stage. The whole ceramization process is the first exothermic and then endothermic process. The ceramic structure of silicone rubber is mainly composed of SiO₂ ceramic structure and C=C cross-linked structure and aromatic structure carbon layer, which has excellent thermal stability, heat and mass insulation, which can effectively reduce the fire risk of cable.