With the increase of the mining height, the operational condition of the hydraulic support is getting worse. Since the column and the balance jack are both regarded as rigid structural parts or springs with constant stiffness, this simplification cannot reflect the characteristics of each stage of the working process. To improve the analysis accuracy, a rigidity-variable impact dynamic simulation platform for hydraulic support with ultra-large mining height based on rigidity-flexibility coupling is constructed in this study. Firstly, stress states of hinge joints of the support when parallel surface loads, raising surface loads and down surface loads act on the upper beam were simulated, and critical loads of different hinge joints were recognized. Secondly, dangerous impact positions of support corresponding to different hinge joints were found. Finally, the overall influences of impact loads on stress state of the hydraulic support were summarized. Results show that under 6000 kN impact load, the maximum force variation coefficient at the hinge point of the shield beam of the support roof is 10.5, and it's the most dangerous hinged position. This study has certain guiding significance for the optimization of the support structure.