The invention discloses an extracting method for residual oil in a grease press cake. The method comprises the following steps that the grease press cake is smashed, water is added to carry out tempering, then cooking and parching are carried out in a closed environment, then the sub-critical extraction technology is utilized for extracting grease in the press cake, and crude oil is subjected to adsorption refining to obtain the grease with strong flavor. By means of tempering and heating treatment, subcritical fluid is utilized for carrying out extraction, a solid refining agent adsorbing method is adopted for removing impurities in the grease, the strong flavor is formed in the grease extracted from the grease press cake with the weak flavor, the flavor of the grease is enhanced, and the effect of fragrance making people pleasant is generated. The commercial value of the residual oil in the grease press cake is improved, the traditional technological process is shortened, the solvent consumption and energy consumption in the production process are reduced, the refining working procedure is simplified, the industrial cost is reduced remarkably, and the extracting method has good economic and social benefits.