Turbine blades, as one of the core components of aero-engines, operate in high-temperature and high-pressure environments for a long time. Radiation thermometry has been widely applied in temperature monitoring of turbine blades in high-temperature environments due to its advantages of not affecting the temperature field distribution of the blades, high sensitivity and fast response speed. To address the limitations of the existing reflection radiation error correction methods in radiation thermometry, a multiple-reflection radiation error correction method for radiation thermometry of aero-engine turbine blades is proposed. Combining the two-color pyrometry techniques, a multiple-reflection radiation model is established that simultaneously accounts for reflections from the front stage guide vane, adjacent rotating blades and the combustion chamber walls. Based on the model, the simulation analysis and experiment of reflection radiation error correction are performed. Experimental results demonstrate that after correcting the reflection radiation error within the measured temperature range, the temperature measurement error is reduced from 2.3%~3.3% to ±0.78%, effectively achieving the correction of reflection radiation error.