Method for refining enhanced oil product solvent

The invention discloses a method for refining enhanced oil product solvent, which aims at separating saturated hydrocarbon and aromatic hydrocarbon with less rings and long side chains in raw oil to refined oil as much as possible, so that the yield and the quality of the refined oil can be improved. The method is characterized in that furaldehyde, N-methyl pyrrolidone, phenol or dimethyl sulfoxide is taken as an extracting solvent, C7-C12 alkane is taken as an enhancing solvent, the extraction process is carried out in an extraction tower, the extracting solvent enters from the upper part of the solvent extraction tower, raw oil enters from the middle-lower part of the extraction tower, and the enhancing solvent enters from the lower part of the extraction tower; refined liquid comes out from the top of the extraction tower, and the refined oil, the extracting solvent and the enhancing solvent are obtained by evaporating and recovering the solvent; extraction liquid comes from the bottom of the extraction to