The invention provides a pure motor driving system which includes a battery pack, a gear box and a main drive motor; the battery pack supplies power to the main drive motor; the main drive motor inputs a power to the gear box; wherein, the main drive motor includes a first main drive motor and a second main drive motor. As the two main drive motors with relative lower power are adopted for replacing the existing main drive motor with a large power, therefore, the pure motor driving system can effectively solve the problems that the main drive motor with a large power can not be arranged as the space of a front cabin is not enough and is difficultly designed; devices with large power are difficultly designed and selected; the main drive motor with a large power affects the balance of the integral car, etc.