The invention discloses a preparation method of extrusion type flame-retardant silicone rubber by taking ester wax as a mold release agent, and relates to the technical field of preparation of extrusion type flame-retardant silicone rubber. The extrusion type flame-retardant silicone rubber is prepared by banburying and open-milling 100 parts of methyl vinyl silicone rubber, 50 parts of gas-phase white carbon black, 40 parts of aluminum hydroxide, 50 parts of magnesium hydroxide, 10 parts of zinc bornate, 2-4 parts of ester wax, 15 parts of structural control agent and 2-4 parts of silane coupling agent. According to the extrusion type flame-retardant silicone rubber disclosed by the invention, the ester wax is taken as the mold release agent, so that peel-off of an insulating layer and a conductor can be strengthened, the processing performance of a finished product cable is improved, and the defect that the silicone rubber product is poor in foaming, oil-discharging and mold-releasing performances as the conventional flame-retardant silicone rubber takes stearic acid or silicone oil as the mold release agent can be effectively improved.