In order to solve the problems of difficult and passive construction and complex process during roadway excavation under complex geological conditions, based on the engineering background of the machine lane in 818 in Xinhu Coal Mine of Huaibei Mining Industry, this paper puts forward the scheme of using ground directional drilling pre-grouting technology to control the surrounding rock of roadway before excavation. FLAC3D software is used to simulate the deformation characteristics of surrounding rock before and after grouting. After the field grouting test, the diffusion of slurry in surrounding rock is observed by means of borehole peeping. Combined with the geological conditions and construction characteristics of the roadway, the support form of gangue roof roadway is determined, and the long-term continuous mine pressure monitoring is carried out in grouting area and non-grouting area. The results show that under the same support form, compared with the non-control area, the two-side convergence and roof subsidence in the control area are reduced by 31.82 % and 36.77 % respectively, which proves that the ground directional drilling pre-grouting surrounding rock modification technology has a good effect on strengthening the self-bearing performance of surrounding rock and improving the stability of roadway.