The invention discloses a method for precisely quantitating the oil content in hogwash oil. The method comprises: S1, measuring the weight m[container] of a measuring container by a weighing tool; S2,adding a certain amount of preheated hogwash oil to the measuring container, and measuring the total weight m[total] of the measuring container containing the hogwash oil by the weighing tool; S3, placing the measuring container containing the hogwash oil in a centrifugal separator, and carrying out centrifugal separation; S4, obtaining the oil liquid in the measuring container, and measuring theweight m[oil] of the oil liquid by the weighing tool; and S5, obtaining the oil content in the hogwash oil according to a formula n=m[oil]/(m[total]-m[container])*100%. According to the present invention, the design of the technical scheme is exquisite; the layering of the oil, the water and the solid in the hogwash oil can be rapidly achieved by using the centrifugal separation principle so as to effectively extract the oil liquid in the uppermost layer, such that the oil content in the hogwash oil can be precisely calculated through the formula, the accuracy is high, and the data is quantified so as to establish the foundation for the rapid determination of the oil content in the hogwash oil and provide the effective basis for the purchaser in the cost determination.