In the geological exploration of the Adit, the texture, section, joint and other rock structural information are important factors to determine the stability of the Adit. Therefore, the collection and analysis of rock data information are the premise work and the key process of the safe production. Faced with the actual requirements of Adit 3D reconstruction, an automatic 3D reconstruction system is designed to replace human work. Aimed at and the special structure of the Adit, a novel mobile robotic platform is designed to realize the automatic image collection of the Adit. At the same time, this paper combines with SFM(Structure from Motion) algorithm and PMVS(Patch-based Multi-view Stereo) algorithm to realize automatic Adit 3D reconstruction. The experimental results show that this system can better replace human work to finish the task of Adit 3D reconstruction without any prior knowledge.