The invention discloses a method for researching dye in solid-liquid interface adsorption kinetics by means of an optical fiber evanescent field sensor. The invention comprises the steps that 1, the optical fiber evanescent field sensor is assembled; 2, a light source with the particular wavelength is selected according to the spectral property of the dye; 3, a second peristaltic pump is switchedon, a dye solution is pumped into a runner, change of an evanescent field is detected in real time through a photo-multiplier tube, and a value, changing with time, of a signal value detected by a photo-multiplier tube detector is recorded; 4, the second peristaltic pump is switched off, a first peristaltic pump is switched on, and eluent is pumped into the runner to elute the dye adsorbed on thesurface of a thin film; 5, a curve, changing with time, of the signal value detected by the photo-multiplier tube is made, and the dye adsorption kinetics is analyzed and researched. The optical fibersensor is high in sensitivity, it can be detected that dye molecules are adsorbed to the solid-liquid interface, and then the evanescent field changes slightly, and the optical fiber sensor is applicable to the solid-liquid interface adsorption kinetics.