The accurate acquisition and analysis of fracture structure of rock mass is of great significance for the stability analysis of trenchless drilling rock mass in ecologically fragile areas. Based on close-up photogrammetry technology， this paper uses PhotoModeler Scanner software to process the feature point distortion and noise removal of multi-directional rock mass images to achieve accurate extraction of three-dimensional information of dense point clouds， and then establish a triangular mesh， establish dense surfaces according to the triangular network， and finally render the surfaces through data visualization to realize the three-dimensional modeling of rock masses. The established 3D model fracture morphology tends to be consistent with the original fracture， which can realize non-destructive picking and observation of fracture length， average width， area and other parameters， and compare the obtained fracture information， and the results are consistent with the visually reflected fracture development degree.