The invention discloses a substep dynamic coupling support method for roadway fault fracture zone, belongs to the technical field of the mining shaft building support, and solves the problem in the prior art which the roadway support effect of the fault fracture zone is poor. The method comprises the following steps: firstly, after excavating and forming the roadway coarse section of the fault fracture zone, selecting the mixed flexible fiber concrete to spray a spraying layer in certain thickness, and forming an initial spraying layer to close the surrounding rock fracture; after the severe deformation rate of the surrounding rock is stable, performing the installation of 'anchor, net, belt and cable', and forming a support layer; and then installing a horseshoe closed bracket on the inner side of the roadway, wherein the closed bracket has scalability so as to limit the mass deformation of the surrounding rock, re-spraying the concrete and performing the full fracture surface grouting; and finally laying crushed gangues on the bottom plate of the roadway, pouring the concrete terrace and the like. The substep dynamic coupling support method for the roadway fault fracture zone is capable of using the surrounding rock stress release and roadway support as one dynamic coupling support system, mixing the roadway dynamic support principle and the substep reinforcement technology, and corporately developing the active and passive support functions.