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As the key component of aviation rescue system, the automatic parachute opener can open the parachute automatically by height control. So it is very important to detect the height control precision. Aiming at this point, a pressure altitude calculating method was put forward based on linear interpolation, accordingly, a simulation test system for unlocking height of automatic parachute opener was designed. This system selected the PMC51 pressure sensor and AD7705 converter to perform data acquisition and conversion, and used STC89C52 MCU for data processing and control, so then realized the motion control of automatic parachute opener, height simulation and height real-time display. The experimental result shows that the system has high accuracy and good stability, can satisfy the request of unlocking height detection of various models of the automatic parachute opener, and its detection error is lower than 0.1%.