The method of oil film thickness measurement based on ultraviolet-induced fluorescence technology has been widely used in wind tunnel oil flow tests. However, pose change of the model bearing the fluorescent oil film will affect the accuracy of oil film thickness measurement in dynamic wind tunnel tests. In the scene of primary illumination of ultraviolet excitation light source and direct imaging of oil film, the error in the imaging fluorescence intensity caused by the model pose change is analyzed theoretically and experimentally. The changes in the radiation characteristics, received fluorescence intensity, and imaging received fluorescence intensity of the model surface are investigated when the measured model is translated or tilted. The accuracy of oil film thickness measurement is represented by the error of the imaging fluorescence intensity. The analysis results show that the error in the oil film thickness measurement depends on the translation distance, and a longer translation distance results in a larger error when the model translates. The relative error of oil film thickness measurement is less than 1% when the model takes on a small-angle tilt (-4°--4°).