The work aims to explore suitable carbon nanomaterials to replace the drying source of the traditional varnishing machine, making it more energy efficient and optimizing the drying effect and to study the effect of different preparation conditions on the curing and electrical conductivity of the heating plate of this material, and the electrical heating law to provide a basis for the key technologies of the varnishing machine drying source. The heating plate of carbon nanomaterials was prepared by screen-printing technology, and the suitable material was selected by analyzing the physical properties of different carbon-based material heating plates. At the same time, the conductivity of the material under the conditions of carbon content ratio, sintering temperature, and coating thickness was further studied, and the electrification experiment was conducted to study the electrical heating performance. The carbon nanofibers with a diameter of 150 ~ 200 nm were more suitable for the preparation method. The purified water had a good modulation effect as a solvent and was convenient to obtain. The conductivity of the heating plate of carbon nanofibers decreased with the increase of sintering temperature and increased with the increase of thickness and carbon content. As the resistance of the heating plate increased, the electrifying time prolonged, and the current rose, the temperature rise became large and the heat produced was more. Carbon nanofibers are suitable for making the drying source of varnishing machine drying equipment due to the high conductivity, high thermal efficiency, and environmental protection to improve drying efficiency and reduce energy consumption.