Taking the southern Zhulin Coal Mine as the research object, the two-dimensional in-situ stress of the 11075 transportation floor pumping roadway of Zhulin Coal Mine was measured by fixed-point hydraulic fracturing, and the principle was to drill a vertical hole in the roof rock formation, select the borehole section with less disturbance, and then inject high-pressure water fracturing, and obtain the direction of the principal stress through the borehole. Based on reliable measured data, the COMSOL Multiphysics simulation software was used to establish a phase field model of hydraulic coupling based on the multi-field coupling of the governing equations of the phase field, the governing equations of fluid flow, and the governing equations of stress and strain. The numerical example shows that under the condition of σ_x0/σ_y0=1.2 stress boundary, the correct displacement distribution and fracture pressure of the fracture are obtained, and the propagation mode of the principal stress fracture is captured. The reliability of hydraulic fracturing is verified by the analysis of the internal stress and fracturing influence of the fracture hole after downhole hydraulic fracturing, as well as the comparison of field measured fracturing test data and model simulation.