The invention discloses a method for actually measuring a geological section based on spatial coordinates, which relates to the field of geological surveying and mapping, and solves the problem that according to the existing method, a large number of people are required for field surveys in a layered rock layer area, and the calculation amount of drawing an unfolded map and a projected map is large and the process is cumbersome. question. The technical scheme adopted by the present invention is: the method of actually measuring geological section based on spatial coordinates, including drawing an unfolded map and drawing a projection map, and drawing an unfolded map includes: field geological surveying and mapping, determining a baseline, planning a section line, determining and numbering geological points, obtaining The spatial coordinates of the geological points, and the geological description and occurrence measurement; then construct the layered boundary surface, construct the expansion surface, etc.; then draw the expanded map, draw the terrain contour line, mark the azimuth, and finally obtain the expanded map of the measured geological section . To draw a projection map, first conduct field geological surveying and mapping, then organize the data, and finally obtain a projection map of the measured geological section. The present invention is suitable for use in areas with layered rock formations.