In recent years, wind-dispersed plant seeds (e.g., dandelion and salsify seeds) have attracted considerable attention in the bionics field due to their high-porosity disc structures, which hold potential value for the development of new bionic aircraft. Most existing studies rely on numerical simulations and particle image velocimetry (PIV) technology in traditional wind tunnels to indirectly analyze flow fields and aerodynamic forces. However, these methods are costly, and traditional horizontal wind tunnels fail to meet the experimental requirements for vertical airflow. Therefore, it is particularly necessary to develop a low-cost, efficient, and accurate aerodynamic force measurement method.This study focuses on investigating the aerodynamic force measurement technology for high-porosity disc structures. A vertical flow field test platform was designed and built, and a high-precision, high-sensitivity box-type six-component balance was developed. To avoid the interference of vertical airflow on the measurement accuracy of the balance and the flow field quality, a cascade structure with annular guide vanes was designed by drawing on wind tunnel corner flow guiding technology, which guides the vertically upward airflow to the horizontal direction.The influence of the guide vanes on airflow deflection was analyzed using the computational fluid dynamics (CFD) method. The results show that under a specific installation angle, the airflow deflection is uniform and tends to be horizontal, exerting little influence on the flow field of the test platform. To verify the accuracy of the platform, a 14 mm dandelion seed model was scaled up by 18 times, and numerical simulations and wind tunnel experiments were conducted on simplified models with different porosities. The drag force data showed good agreement, indicating that the platform has high measurement accuracy within the considered error range.