Abstract: Poor coal wall stability, coal wall slippage, top coal leakage and other problems often occur in the roadway excavation face under the conditions of soft and thick coal seam roof, and the surrounding rock of the roadway excavation face must be reinforced.Comprehensive use of mine pressure theory analysis, numerical simulation and other methods, the mechanism of coal wall spalling was studied, and the “coal wall water injection+metal scaffolding” joint support technology was put forward.Research results show that: in the tunneling process, the coal and rock junction between the two sides and the middle of the roof is a weak area prone to spalling, and needs to be reinforced.By injecting water into the coal wall combined with the metal roof protection skeleton, the safe and efficient tunneling is ensured, and the application of this technology not only effectively prevents spalling, but also improves the control of surrounding rock deformation.The maximum deformation of the roof was 24.8 mm, and the convergence of the two sides were 21.5 mm during the 40 d of on-site observation, and the deformation of the roadway was controlled within the safety range.