The invention belongs to the technical field of energetic materials and relates to an ETN-DNT eutecticevaporate energetic material and a preparation method thereof. The ETN-DNT eutecticevaporate energetic material and the preparation method thereof aim at achieving the effects that the composite energetic material is low in sensitivity, high in energy, low in melting point and great in NC dissolving capacity. The ETN-DNT eutecticevaporate energetic material is prepared from, by mass, 20-70% of 1, 2, 3, 4-erythritol tetranitrate, 20-70% of 2, 4-dinitrotoluene, 1-5% of a stabilizing agent and 1-10% of a desensitization agent, wherein the stabilizing agent is a mixture of 2-nitrodiphenylamine and diethyl diphenyl urea, the 2-nitrodiphenylamine accounts for 20-80% the total mass of the stabilizing agent, and the diethyl diphenyl urea accounts for 20-80% the total mass of the stabilizing agent; the desensitization agent is one of or a mixture of dioctyl sebacate, glycerol triacetate or dimethyl phthalate. The energetic material has the advantages that detonation heat energy is maintained to be 5139 kJ/kg and above, detonation velocity energy is maintained to be 7008 m/s and above, and energy performance is high.