It is one of the key technologies to extract the center of laser stripe quickly and accurately when using linear Structured light for 3D measurement of workpiece.In this paper, a method that a laser center extraction method based on spatial gray gravity center advancing is proposed.which method bases on advancing the gray center of gravity in the laser stripe space, combining the eight neighborhood decision method to select the light stripe space area, then extracting the new spatial gray Barycentric coordinate system coordinates of the selected area;The pauta criterion eliminates abnormal center points and ultimately obtains the laser center coordinate information behind completing the entire image extraction.The experimental shows that the Root-mean-square deviation of the extraction center of the proposed algorithm is 0.492 pixel, which is 9.8% higher than the optimal extraction precision Steger improved algorithm, and the extraction speed is 5 times higher. Compared to the internal advancement algorithm with the best processing speed, while maintaining the extraction speed, the accuracy has been improved by 24.1%.At the same time, the proposed algorithm greatly enhances the processing ability of under exposed light stripe images, effectively reduces the restriction of the environment on the measurement of line Structured light.