Abstract: In order to study the deformation and failure laws of roadway surrounding rock under the condition of layered rock, the one orbit lane of Shandong Yuncheng Coal Mine was taken as the research background, and PFC2D discrete element software was adopted to study the stress, deformation and crack development of surrounding rock during excavation. Meanwhile, the influence of rock thickness variation on deformation and failure of surrounding rock was analyzed. The results show that: after the excavation of layered rock roadway, the radial displacement of surrounding rock roof will have a non-smooth transition in shallow of mudstone about 1 m, while the surrounding rock floor in the mudstone will overall uplift and appear phenomenon of separation; the surrounding rock crack of straight wall arch roadway will first appear at the vault and wall foot on both sides, with the increase of the excavation time, the crack of the roadway will gradually extend to the top and two sides, which causes a roof fall accident; with the increase of mudstone layer thickness, the displacement and failure area of the roadway surrounding rock will both decrease first and then increase.