81021 roadway in Pulongwan coal industry is taken as the engineering background, the deformation and failure mechanism of sub-level roadway and the surrounding rock control mechanism of strong wall support under close-range coal seam are studied, and the repair and strengthening scheme of sub-level roadway under close-range coal seam is analyzed,. The results show that the two sides of 81021 roadway are characterized by dilatancy-dilatancy failure, shear-slip failure of the wall-roof-floor interface, and fracture of coal and rock mass, the deformation of both sides leads to the subsidence of roof and strong floor heave, and the surrounding rock is broken at roof and shoulder socket 81021 roadway adopted super-high strength integrated bolting and grouting technology, the total displacement of roadway wall rock is small, wall rock is relatively stable, wall rock bearing capacity has been significantly strengthened and improved, the safety and reliability of support are greatly improved.