With the progress of science and technology and the needs of industrial development, traditional heating methods have gradually failed to meet the requirements of modern industry for accurate control and energy efficiency. In this context, self-regulating heating cables have become an indispensable heating solution for many industries with their unique advantages. In this paper, the working principle of self-regulating heating cable and its application in different fields will be discussed in depth.   Self-regulating heating cable is a modern electric heating product made of a special composite structure of conductive core strip and insulating material, combined with materials with positive temperature coefficient (PTC) characteristics. This cable can automatically adjust its output power according to the temperature change of the working environment, maintain a constant temperature, without external control system, to achieve true self-regulation function.   In terms of core principles, the self-regulating heating cable mainly relies on the characteristics of its internal PTC material. PTC material has low resistance at low temperature and generates heat when current passes through; As the temperature increases, the resistance of the material also increases, resulting in a decrease in the current passing through, thereby reducing the heating power, and eventually reaching a preset temperature equilibrium point. This process is completely automatic, fast response, high temperature control accuracy, and is not affected by environmental changes and cable length.   In the field of application, self-regulating heating cable is widely used in petroleum, chemical, electric power, metallurgy, machinery and other industries of pipeline, valve, tank insulation and antifreeze, as well as all kinds of process equipment heat tracing insulation. Due to its reliable performance and ease of installation, the self-regulating heating cable can work stably in extreme weather conditions, effectively preventing freezing of pipes and reducing the efficiency of equipment operation.   In summary, self-regulating heating cables, with their unique positive temperature coefficient materials and intelligent temperature regulation mechanisms, play an important role in improving the operational safety and energy efficiency of industrial facilities. With the continuous progress of technology and the improvement of environmental protection and energy saving requirements, this heating technology will undoubtedly play a more important role in future industrial applications.