In order to study the blasting mechanism of deep rock under different geostress conditions when the uncoupling coefficient changes, the dynamic finite element software is used to simulate the influence of uncoupling coefficient on the blasting damage effect of deep rock under the conditions of unidirectional geostress and bidirectional equivalent geostress, and the distribution of crushing zone and fracture zone and the change trend of circumferential stress under different working conditions are obtained. The results show that the peak value of circumferential stress, the area of crushing zone and the area of circumferential fracture zone decrease significantly with the increase of uncoupling coefficient under the two stress conditions. Under different ground stress conditions, the influence trend of uncoupling coefficient on rock crushing effect and circumferential stress is different.