Abstract: A unified understanding and digital representation of the entire real mine and its related phenomena is an important part of digital mine construction，and 3D modeling and visualization of underground mine roadway is the core contents of digital representation.Aiming at the inefficiency of traditional 3D roadway modeling method of low efficiency and high cost，a 3D modeling method of underground roadway based on close-range photogrammetry technique was proposed. The modeling method mainly adopts the principle of close-up photography to measure the forward intersection of stereo pairs，uses the camera to obtain a set of images of the same target at different spatial positions，and calculates the geometric constraint relationship between the images to obtain the 3D coordinate information of the target surface to construct the 3D model of shooting target.Firstly，low-cost smartphone camera was adopted to collect multi-perspective close-up photos of the roadway；then，digital image modeling Context Capture software was used to perform aerial triangulation calculations on the image data and generate underground roadway points cloud data；finally，feature extraction and image matching were conducted on the obtained photos to complete the construction of 3D modling of underground roadway.Taking the underground air-raid shelter roadway of Henan Polytechnic University as the study example，566 photos were taken，the overlap between the photos is about 80%. The data processing results show that the 3D model structure of the object is complete and the texture is clear，which indicated that the method of 3D modeling method based on close-range photogrammetry is feasible.

Key words: digital mine, close range photogrammetry, 3D modeling of roadway, texture