A rigid-flexible coupling dynamics model is proposed for the wind turbine crane's truss boom system, considering the large slenderness ratio of the structure and the complexity of the operating environment. This model simultaneously addresses the vibration of the truss boom and the swing of the suspended load. The system is modeled using an equivalent spring-mass-damping system, a suspension system, elastic two-force bars, and an instantaneous wind model to simulate the elastic vibrations of the truss boom, the swing of the suspended object, the rope dynamics, and the wind load. The rigid-flexible coupling dynamics of the truss boom-lifting system is established using Lagrange's equations, and dynamic response analysis is conducted in SIMULINK. Based on the input shaping technique, an input shaper is designed for the target wind turbine crane. An anti-sway control simulation platform is also built in SIMULINK for experimental testing. Results show that the ZVD_2 input shaper provides an effective anti-shaking control for large flexible truss arm systems.