Abstract: In order to solve the problems of slow construction speed, high support difficulty, and easy occurrence of roof caving accidents in large-span cutting of thick coal seams, the 3206 working face cutting of a certain mine is taken as the research object. Theoretical analysis and on-site measurement research methods are used to study the deformation and control technology of the surrounding rock of large-span cutting of thick coal seams. Based on the Pugh's collapse arch theory and limit equilibrium theory, the height of the collapse arch at the cut hole of the working face is calculated to be 2.77 m, and the width of the plastic failure zone on both sides is 2.11 m. It is pointed out that the concentration of tensile stress in the large-span cut hole and the length of the roof anchor rod being less than the height of the collapse arch are the main reasons for the large amount of roof subsidence and even roof collapse accidents. The use of secondary tunneling construction technology and roof "long and short anchor cables+steel ladder beams+steel mesh" support, as well as the use of "single hydraulic pillar+π - shaped beam+wooden crib" reinforcement support for surrounding rock control technology, ensured the rapid construction of the working face cut and effectively controlled its surrounding rock deformation, laying the foundation for the installation of mining equipment and rapid production in the working face.