For the high pressure and large flow valve of hydraulic support, a test bench with double accumulators as auxiliary power source was designed, the time-sharing and rapid loading of the system could be realized with booster cylinder. The test bench could provide short-time large flow and high-pressure impact to simulate the working condition of hydraulic support bearing severe roof impact. The simulation model of the test system was established based on AMESim software, and FAD100/40 type safety valve was used as the test object, the impact pressure safety and nominal flow on-off characteristics were simulated and analyzed. The results show that by using the designed safety valve impact test system, the impact pressure in front of the valve specified can be reached in the national standard within the specified time; the opening pressure, flow rate, pressure rise gradient and nominal flow overflow time of the tested valve provided by the nominal flow opening and closing characteristic test system all meet the requirements of the national standard, which further verifies the rationality of the test bench and test method.