Method for detecting moisture in crude oil

The invention provides a method for detecting moisture in crude oil. The method for detecting moisture in crude oil comprises an analysis model establishment stage and a detection stage. The analysis model establishment comprises the following steps: (A1) detecting light emitted by a light source passes through a plurality of colorimetric pools to respectively obtain transmission spectrums; the optical path L of the detection light in the colorimetric pool belonging to [0.8, 2.2] mm, different crude oil samples being contained in the colorimetric pool, and the water content of the crude oil samples being known; (A2) dividing a correction set verification set according to the transmission light source and the corresponding water content; (A3) preprocessing the transmission spectrum, wherein the preprocessing comprises centralization and weighting operation; (A4) extracting a characteristic wave band from the pre-processed transmission spectrum, and establishing a prediction model of the moisture content of the