The invention relates to the technical field of high polymer materials, in particular to a high-CTI and low-temperature super-tough flame-retardant PC material and a preparation method thereof. The high-CTI and low-temperature super-tough flame-retardant PC material comprises the following components in percentage by weight: 44-66% of PC resin, 20-30% of silicon-containing PC resin, 5-8% of a phosphorus flame retardant, 8-15% of a high-CTI additive, 0.1-1% of an antioxidant, 0.1-1% of a lubricant and 0.2-1% of an anti-dripping agent, wherein the high CTI additive is PTFE with low molecular weight, and the anti-dripping agent is PTFE with high molecular weight. The invention aims to provide a high-CTI low-temperature super-tough flame-retardant PC material and a preparation method thereof.According to the prepared high-CTI and low-temperature super-tough flame-retardant PC material, the flame retardant property reaches 1.6 mmV-0 level of UL94, CTI is improved to 500 V, and meanwhile the PC material can meet the use requirement of a low-temperature environment due to low-temperature toughness.