The invention relates to a preparation method of series ink solvent oil. The series ink solvent oil with excellent properties and special ink solvent oil are obtained by treating oil or coal tar generated through direct coal liquefaction as raw oil, carrying out advanced hydrotreatment and rectification, and taking a wide fraction with a boiling range of 230-370 DEG C or taking one or multiple narrow fraction segments in the wide fraction. The series ink solvent oil which has the characteristics of narrow boiling range, high flash point, light color, low content of aromatic hydrocarbons, good dissolving performance to resins and the like allows ink to have good fluidity, excellent transitivity, rapid solvent release property, good high temperature stability, and excellent mesh point reproducibility and luster performance, and the series ink solvent oil is not easy to precipitate from the ink, has good storage stability, and is mainly used in offset lithography and letterpress ink.