The invention discloses an automobile steering-by-wire system and a control method of the automobile steering-by-wire system. The automobile steering-by-wire system can control the angle of a steering wheel accurately, and a location servo mode of a road sense motor is adopted for limiting the steering angel of the steering wheel instead of a common mechanical limiting mechanism. Double steering motors adopt a redundancy design, simultaneously receive same control instructions sent by a master controller and work in a location servo control mode to drive a steering gear, and therefore not only is reliability of the system ensured, but also the angle of the steering wheel can be controlled accurately. Three-phase alternating current asynchronous motors are adopted for the road sense motor, the first steering motor and the second steering motor, therefore, even if a winding short circuit fault happens, damping torque can not be generated, and safety and reliability of the system are improved. Road sense coefficients of road sense feedback torque can be adjusted according to needs, personalized configuration of road sense intensity is achieved, and driving comfort is improved.