The attitude of the airdrop system is an important technical indicator for evaluating its system performance and an important basis for improving landing stability. In response to the practical testing requirements for attitude measurement of airdrop system, a method for attitude measurement of airdrop system based on high-speed stereo imaging systems is proposed. The mathematical process of central axis vector method to obtain the attitude of air target by planar intersection is demonstrated in detail. By matching target features on multiple images captured simultaneously, the spatial position of the axis is calculated to achieve attitude measurement of the target. Based on the aforementioned testing method, the attitude consistency between the parachute and cargo platform in the airdrop system is further validated. The calculations show that during the simulated airdrop process, the maximum attitude deviation between them remains 0.36°, and deviation RMS is 0.21°. These results confirm the representativeness of using the parachute’s central axis to characterize the overall attitude of the airdrop system.