The invention discloses a method for quickly forecasting the shelf life of first-grade refined bean oil. The method comprises the following steps: (1) detecting acid value of the first-grade refined bean oil to be detected as S1; (2) uniformly mixing the first-grade refined bean oil to be detected with distilled water according to a mass ratio of (95-105) to 1 so as to obtain a sample; (3) storing the uniformly-mixed sample at 105+/-2 DEG C for 24+/- 1 hours; and (4) taking the sample out, cooling the sample to 20-25 DEG C, detecting acid value of the sample as S2, and selecting different determination regression equations according to different delta values of the acid value so as to quickly determine the shelf life of the first-grade refined bean oil, wherein according to a calculation formula, the delta values of the acid value are obtained by subtracting S1 from S2. By virtue of the method, the shelf life of the first-grade refined bean oil can be determined in a short time in the manner of detecting the delta values of the acid value, so that the development period and the investment of manpower and material resources are reduced, and development results can be converted to economic benefits as soon as possible; the calculation method is simple and practical.