The invention discloses a transportation support vehicle system used for multi-module transshipment of a large-scale carrier rocket. The transportation support vehicle system comprises a rear-arranged main support vehicle and a front-arranged main support vehicle, wherein the rear-arranged main support vehicle comprises a first underframe and a first bracket arranged on the first underframe, the first underframe is provided with four first steel wheels, every two first steel wheels are symmetrically arranged, the first underframe is further provided with an electric driving device which is used for driving the first steel wheels, and the first bracket is provided with an electronic control system which is used for controlling the electric driving device; the front-arranged main support vehicle comprises a second underframe and a second bracket arranged on the second underframe, the second underframe is provided with four second steel wheels, and every two second steel wheels are symmetrically arranged. The transportation support vehicle system used for multi-module transshipment of the large-scale carrier rocket has the advantages of being simple in structure, convenient to use, and high in control precision and automation degree; meanwhile, the shortcomings that the operation of loading and unloading boxes through manual pushing of a rocket body module is very difficult since no space exists are avoided, the labor intensity is lowered, and the working efficiency is improved.