In order to solve the control problem of large section surrounding rock caused by roadway expansion, the expansion construction of head chamber of belt main roadway in Zhengbang Mine was taken as the engineering background, combined with the methods of theoretical analysis, engineering analogy and numerical simulation, the deformation of the expansion roadway was analyzed and its surrounding rock control technology was studied. The results showed that when the thickness of shotcrete layer reached 150 mm, the stress relaxation area of surrounding rock was smaller and the depth of plastic area was generally less than 2.2 m. When the anchor spacing was large (0.8~1.2 m), the bearing capacity of the pressure arch kept low stress value; with the anchor spacing decreasing (0.8~0.4 m), the bearing capacity of the pressure arch increased rapidly in the form of power function. Based on the above research, combined with the geological conditions of production, the technical scheme of bolt net spray combined support was given, and the field engineering application was used to realize the stability control of the extended roadway.