Abstract: There are multiple challenges for roadway-protecting coal pillar in deep mines, which lead to sudden destabilization of the coal pillar under the influence of dynamic load disturbance.Taking the protected coal pillar in the south side of No.5 coal synthesized mining face of Laomupo Coal Mine as the research object, FLAC^3D numerical simulation technology was used to simulate and analyze the damage and destabilization process of the deep roadway coal pillar under the effect of dynamic load perturbation.The results show that: Increasing the size of the coal pillar can improve its structural stability and reduce the instability and damage of the pillar due to the high concentration of local stress; The increase in the intensity of the external dynamic load will lead to the deterioration of the stress state of the coal pillar, which can lead to the overall instability and damage; A method for identifying the instability and damage of the coal pillar under the influence of the dynamic load perturbation in the deep mine environment is proposed and verified by engineering examples.