Abstract: Aiming at the problem that the small and medium-sized spray boom restrained by steel cable is easy to produce sudden stop oscillation when the sprayer is excited by obstacles in field operation, which affects the application effect, The dynamic behavior modeling and experimental study of spray boom restrained by steel cable were carried out. Firstly, a theoretical model of the dynamic response of spray boom restrained by steel cable was established, after which the dynamic behavior of the spray boom restrained by steel cable under step excitation was studied on the spray boom vibration test system. The time-domain response of spray boom movement was characterized using a multi-channel dynamic test system, and the simulation results of the theoretical model of the dynamic response of spray boom restrained by steel cable were verified. The correlation coefficient between the simulated and experimental results was 0.910 4, and the maximum relative error was 10.44%. The model and experimental results established in this paper lay the foundation for the subsequent research on the vibration balance control of the spray boom based on variable damping.