Aiming at the problem of large deformation in soft rock dynamic pressure roadways of mine, mechanical experiments, in-situ stress testing, anchor cable anchorage force testing, surrounding rock structure observation and other field and laboratory experiments were conducted, the main control factors affecting the stability control of roadway were revealed from the perspectives of primary support strength, key parts of roadway and surrounding rock lithology. The stability control scheme of deep ultra-thick coal seam, extremely soft rock and dynamic pressure roadway was put forward. The combined support technology of high preload bolt and cable + backwall filling with concrete + U-shaped steel arch + grouting cable + bottom corner concrete-filled steel tube was used to control the deformation and failure of deep soft rock roadway. Field test results show that the deformation of roadway surrounding rock is reduced by more than 95% after adding grouting cable and bottom corner concrete-filled steel tube on the basis of original support, which provides valuable experience for the control of nonlinear large deformation of soft rock roadway in other coal mines.