Exploring the possibility of the application of roof cutting pressure relief and filling support collaborative roadway protection technology has important forward-looking significance for deep coal mine mining. This study addresses the large deformation problems of the mining roadway in the 03 working face of a coal mine by proposing the theory of roof cutting and filling collaborative roadway protection. CO₂ mineralized filling materials were developed, and the optimal roof cutting scheme was determined through theoretical analysis and numerical simulation. Field roof cutting tests were conducted to validate and optimize the parameters, and the stress and deformation characteristics of roadway surrounding rock in fractured and unfractured areas were monitored. The results show that the optimum drilling parameters are coal pillar side tilt Angle of 15°, height of 35 m, gob side tilt Angle of 13°, height of 25 m, and the theoretical pressure relief effect is the best. When the ratio of coal gangue and fly ash is 9:1, the compressive strength of CO