At present, deep hole blasting is widely used in the prevention and control of rock burst of hard roof and anti-reflection of coal seam.The hole of deep hole blasting is under confining pressure.However, the influence of confining pressure on the effect of deep hole blasting is still incomplete.In this paper, the numerical simulation software ANSYS/LS-DYNA is used to simulate the formation process of blasting cracks under the two conditions of confining pressure and without confining pressure.Based on the failure characteristics of rock after blasting, the similarities and differences of fracture zone, fracture zone and vibration zone and the differences of blasting crack morphology under the condition of confining pressure are compared and analyzed.The results show that under the condition of no confining pressure, the crack propagation direction is radially and evenly distributed around the hole, and the angle between the main fracture propagation direction and the direction of the minimum principal stress is about 20° under the condition of confining pressure.The corresponding crack length also decreases, indicating that confining pressure significantly affects the final shape of blasting crack.Under the condition of broken zone is almost the same time and radius, boundary element stress-time history curve and curve shape of shock wave peak pressure change is roughly same, indicating blasting crushing zone and occurring in the process of explosion stress wave and velocity of propagation, the propagation law of shock wave in the propagation and attenuation rule is influenced by confining pressure effect is smaller.