Grid chart cut geological section wiring method for improving content expression precision of geological three-dimensional model

The invention discloses a grid chart section establishment method for improving the expression precision of a geological three-dimensional model, and the method comprises the steps: A, preparing a geological base map, and collecting a latest geological map and a latest topographic map which can completely cover a modeling region; B, arranging grid-shaped section lines, wherein the grid-shaped section lines are arranged according to the direction of a group of main construction lines of the modeling area; C, generating a profile frame diagram of the graph-cut geological profile lines, drawing a corresponding terrain profile diagram along each graph-cut geological profile line forming the grid shape to obtain a geological boundary marking line corresponding to each profile, and superposing the terrain profile diagrams and the geological boundary marking lines to obtain the profile frame diagram; and D, section compilation: completing geological structure compilation of the graph-cut section on the basis of the