Digital image correlation (DIC) measurement methods are widely accepted in the field of aeroengine blade measurements. However, there are many factors affecting the accuracy of DIC in engine blade high-temperature measurements, such as thermal radiation and thermal disturbance. To solve these problems, we propose an image preprocessing method to improve the accuracy of high-temperature DIC measurements. A series of high-temperature experiments are performed. The experimental results show that the proposed method can effectively eliminate the influence of thermal radiation and thermal disturbance caused by the high-temperature environment. The method reduces the displacement error, which can be eliminated by ∼70%. Experimental results verified the effectiveness of the proposed method.