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In the past, the discharge probe method and ultrasonic method were easily affected by the environment, and the aero-engine blade profile size detection was not accurate, and the detection took a long time. In order to solve this problem, a research on non-contact detection of aero-engine blades based on line laser scanning is proposed. According to the aero engine structure. Using a line laser scanning device, combined with a CCD camera, a resolution of 768×576pix image acquisition card, and 23 stepping servo motors, the detection of three-dimensional spatial position information can realize the conversion of the coordinate system in the X direction. After determining the position of the light bar, construct a mathematical model of line laser scanning detection, determine the conversion relationship between the height value of the image coordinate system and the real space height value, and complete the blade shape size scan. Design a non-contact detection process to avoid environmental interference, and reflect the blade shape size through the peak light intensity. With the support of the four-coordinate detector, the experimental verification and analysis are carried out. From the experimental results, it can be known that the size error of the aeroengine blade profile detected by this method is between -0.008mm~+0.009mm, and the allowable error is within the range of ±0.01m. The detection results are accurate and the detection efficiency is high, which can provide technical support for the stable operation of aviation.