The invention relates to the technical field of cable rubber, in particular to an insulated cold-resistant flexible cable.The insulated cold-resistant flexible cable comprises an insulating layer consisting of 60-70 parts of polyvinyl chloride resin, 3-8 parts of rosin, 6-10 parts of hyperbranched polymer grafted SBS (styrene-butadiene-styrene block copolymer), 20-30 parts of fire retardants, 1-5 parts of antioxidants and 1-5 parts of anti-irradiation agents.Modified hyperbranched polymers instead of conventional plasticizers are added into the insulating layer of the insulated cold-resistant flexible cable to achieve better plastifying effect, and under synergism of all components, hardness of the insulating material is decreased, so that both flexibility and excellent electric insulation effect are achieved.The insulated cold-resistant flexible cable attains not only flexibility and electric insulation property but also high mechanical property and ageing resistance, such as high tensile strength and large elongation at break.