Solid carrier rockets are typically transported over long distances using a combination of road and rail transport. During the transfer process between road vehicles and railcars, the highly variable outdoor environment and significant disturbances result in slow transfer velocities and prolonged transfer times, thus reducing the efficiency of transporting solid carrier rockets. To address the issue of extended transfer times under large disturbance outdoor conditions, a hoisting device with a two-stage rigid-flexible conversion mechanism was utilized to achieve rapid docking during the transfer process, significantly reducing the transfer time. Modeling and simulation of the rigid-flexible conversion mechanism were conducted using ADAMS to analyze the motion and force characteristics of the mechanism and the suspended load under various conditions. The results substantiated that the two-stage rigid-flexible conversion mechanism ensured docking precision under windy conditions, thereby shortening the docking time. This achievement enabled the rapid transfer of solid carrier rockets in outdoor windy conditions, reducing transfer time by 34.2%. This study provides a design reference for the swift and stable transfer of solid carrier rockets and other heavy loads.