The invention relates to a correction method of an up-conversion fluorescence strength ratio temperature measurement technology. The objective of the invention is to solve the problem about inaccurate temperature measurement results of an existing temperature measurement technology. The method comprises that exciting light emitted by an exciting source is gathered by a convex lens and then irradiated on a temperature sensing material, up-conversion fluorescence emitted by the temperature sensing material is gathered by the convex lens and then irradiated into a spectrograph, the spectrograph is connected to a storage oscilloscope and a computer to realize data processing, a correction curve is given and finally the method is completed. The correction method provided by the invention eliminates deviations between a fluorescence strength ratio and Boltzmann distribution laws, maintains advantages of a fluorescence strength ratio method such as good resistance to interference, good stability and high sensitivity, and increases accuracy of temperature measurement. The correction method of the up-conversion fluorescence strength ratio temperature measurement technology provided by the invention is applied in the field of rare-earth fluorescence temperature measurement.