The invention relates to the field of infrared temperature measurement, in particular to a tokamak divertor target plate temperature accurate measurement method. The method comprises the following steps: 1) fitting the relation between the radiation energy emitted by a blackbody furnace and the radiant energy measured by a thermal imager; 2) exploring the relation between the emissivity and the temperature in the baking state, and fitting a curve of the temperature and the emissivity; 3) in the discharge state, calculating the real temperature of the divertor target plate according to the grayvalue of the thermal imager picture. Therefore, the emissivity obtained by the method is a value which changes along with the change of the temperature, and the values of the emissivity of the different detection points are different, the influence of the emissivity as a fixed value on the temperature measurement result is avoided, and the temperature measurement result is quite high in precision; the transmission of the radiation energy of the divertor target plate is under the condition of vacuum, the interference of atmospheric radiation to target radiation is avoided, and the accuracy ofthe measurement result is further improved.