The invention relates to an easily-emulsified compound oil phase for emulsion explosives and a preparation method. The compound oil phase comprises the following substances by mass: 4-10 parts of paraffin, 2-8 parts of microcrystalline wax, 3-20 parts of beeswax, 5-15 parts of machine oil, 10-20 parts of Vaseline, 0-10 parts of asphalt, 0-8 parts of rosin, 0-15 parts of octadecylamine, and 20-55 parts of a water-in-oil emulsifier, wherein the water-in-oil emulsifier is bisoleamide bissorbic acrylate ethanediamine. The preparation method of the compound oil phase comprises steps of melting, blending, curing and cartonning. Compared with the prior art, the oil phase material of the invention matches the emulsifier more reasonably, which significantly reduces the interfacial tension between the compound oil phase and an ammonium nitrate aqueous solution. When the emulsification effect is identical, the rotating speed of an emulsifying machine is decreased greatly, and the emulsification time is shortened; When the productivity is the same, the pressure of a static mixer pipeline is decreased significantly. Substrates prepared by the compound oil phase have storage time of up to 24 months; the explosive storage time is up to 18 months; and the explosion performance of explosives meets the national standard GB/T18095-2000.