The precise positioning of the centroid of spaceborne laser spots can improve the performance and measurement accuracy of optical systems. In order to improve its positioning accuracy, a precise positioning method for the centroid of spaceborne laser spots under visual communication technology is proposed. Firstly, a CCD camera based on diffuse reflection in visual communication technology is used to capture real-time satellite laser spot images; Secondly, using the method of calculating the cross-correlation coefficient of light spots, the similarity evaluation of the collected light spot images is carried out to preliminarily determine the position and shape of the light spot; Finally, the improved Gaussian fitting sub-pixel positioning algorithm is chosen to refine the preliminary positioning results, thereby improving positioning accuracy and obtaining more accurate spot centroid positions. The experimental results show that the proposed method has a centroid positioning deviation parameter within 0.4 pixels in both the x-axis and y-axis directions, and the centroid positioning coordinates in multi frame spot images are relatively concentrated, indicating that the method has high accuracy and stability.