The invention relates to a method for rapidly and quantitatively detecting phorate residue. According to the present invention, a phorate aqueous solution shows a stable absorption peak at a specific ultraviolet wavelength, the phorate content is proportional to the magnitude of the absorbance value, the direct proportion change trend is showed in a coordinate system, a standard curve is established according to the characteristic, a regression equation Y=aX+b (b=0) is obtained, and the detected average absorbance value of a sample to be detected is substituted into the regression equation so as to calculate the phorate content of the sample, such that the phorate residue can be rapidly and quantitatively detected.