Abstract: In the mining process of the island working face of thick coal seam with complex geological conditions, rock burst disaster is prone to occur due to mining disturbance. Aiming at this problem, taking the irregular island working face adjacent to 1311 positive fault of a mine as the research object, an impact risk assessment method of the irregular island working face adjacent to the geological structure was proposed. Firstly, the geological influencing factors were analyzed from four aspects including the mining depth, the physical and mechanical properties of coal and rock, the structure of hard roof strata, as well as fault, and combined with the risk index of rock burst due to geological factors, the impact risk of 1311 working face was determined. Secondly, the influencing factors of mining technology were analyzed, the impact of 1311 working face mining on 7301 coal roadway and Guanzhuang fault was simulated by numerical simulation, and the influence of residual triangular coal pillar was analyzed. Combined with the risk index of rock burst of mining technical factors, it was determined that the working face as a whole was medium impact risk. Finally, the comprehensive assessment method of the impact risk of the working face was used to divide the impact danger area of the working face, and the microseismic monitoring system was used to monitor and verify the danger area. The verification results show that the overall impact risk of 1311 working face determined by the comprehensive assessment method and the classification of the impact risk area are reasonable and accurate.