The invention provides a high-temperature electric heating coating and a preparation method thereof. The high-temperature electric heating coating contains the following components by weight percent: 30%-60% of an organic carrier, 5%-15% of nano-conductive carbon black, 5%-15% of graphite, 0.1%-15% of an aid and 10%-40% of a solvent, wherein the organic carrier contains the following components by weight percent: 30%-40% of a solvent, 15%-30% of phenolic epoxy resin, 15%-35% of bisphenol A epoxy resin, 3%-10% of a dicyandiamide latent curing agent and 0.1%-5% of substituted urea curing accelerator. By utilizing the formula, the prepared high-temperature electric heating coating has the beneficial effects that the long-term use temperature is 100-150 DEG C, the heating temperature is uniform, and the power degradation does not occur after the long-term use. Besides, the preparation process is simple, free from pollution, low in cost and suitable for large-scale industrial production.