［Objective］To address the issues of high energy consumption and poor temperature controllability of traditional electricthermal anti-icing coating.［Methods］ In this study，an electrothermal anti-icing coating based on the positive temperature coefficient（PTC）effect of phase-change of paraffin was prepared by mixing the single-component waterborne polyurethane resin， paraffin emulsion and carbon nanotube aqueous dispersion in a certain proportion.［Results］ The coating exhibits a significant joule heating effect，showing excellent active anti-icing and deicing at lowtemperatures. When the coating temperature exceeds the wax’s melting point，the phase transition of wax in the coating occurs，leading to an increase of the electrical resistance of the coating，which prevents the overheat of the electrothermal coating. Destructive testing confirms that localized damagewith diameters below 4 mm does not compromise the coating’s electro-thermal uniformity. Mechanical evaluations demonstrate exceptional bending resistance，adhesion，flexibility，and impact resistance.［Conclusion］ The electrothermal anti-icing coating with a positive temperature coefficient effectreported in this article can actively suppress the excessively high temperature of the electrothermalcoating and reduce the safety risks associated with heat loss. It provides a new idea for the design ofintelligent anti-icing systems and has broad application prospects in anti-icing systems on the surfacesof equipment such as wind turbine blades，aircraft wings，and railway bogies in frigid regions.