The invention discloses a method for producing solvent oil. The method comprises the following steps of carrying out hydrodearomatization on coking non-aromatics used as a raw material under the action of Ni/gamma-Al2O3, Pt or Pd used as a catalyst, wherein the conditions for hydrogenation reaction are as follows: the temperature ranges from 180 DEG C to 230 DEG C, the operation pressure ranges from 2.0 to 3.0Mpa, the hydrogen-oil ratio ranges from 40 to 70 and the air speed is 0.2-1h-1, and then performing distillation separation on the output after hydrodearomatization to obtain #120 solvent oil at the tower bottom and the #6 solvent oil at the tower top. By using the secondary product of non-aromatics for light benzole hydrogenation as the raw material to produce the solvent oil, the invention improves the use ratio of the secondary product in the enterprises for producing coking hydrogenation benzene, effectively reduces the production cost, and improves the profit. The invention has the advantages of simple method, low production cost and remarkable economic benefit.