<p>The problem of high-precision pointing control of naval guns under multi-source strong excitation, including the ship’s rocking motion and launching load, is the key factor that restricts the launching accuracy of naval guns. An electromechanical coupling dynamic model of the all-electric driven naval gun under multi-source strong excitation was constructed to analyze the transfer characteristics of launching load in the naval gun and its effects on the naval gun’s vibration characteristics. Therein, the ship’s rocking motion under random wave excitation was reconstructed by the harmonic superposition method, and the launching loads including the composite gun tube resulting force, recoil mechanism force, and recuperator force were reconstructed. Simulation results show that: the launching load causes a sudden change of cradle’s angular displacement, respectively, which will influence the attitude of the projectile out of the muzzle. Under the control of the servo system, it needs more than 15 s to recover to the stable state, which is larger than the launching interval in continuous launching condition. So, the superposition of the continuous launching loads causes high-frequency and large-amplitude vibration of cradle’s angular displacement, and the vibration frequency is similar with the launching frequency. All above will affect the launching accuracy of naval guns.</p>