The invention relates to a vehicle steering system which comprises a first push module, a second push module and a steering control device, wherein the first push module is used for adjusting the steering angle of a first wheel, the second push module is used for adjusting the steering angle of a second wheel, and the first wheel and the second wheel are positioned on the two sides of the same steering shaft; and the steering control device is connected with the first push module and the second push module and is used for respectively generating a first steering control signal and a second steering control signal according to the determined expected steering angle of the first wheel and the expected steering angle of the second wheel, and respectively sending the first steering control signal and the second steering control signal to the first push module and the second push module, and therefore the first push module and the second push module can adjust the steering angles of the first wheel and the second wheel relatively independently. The system can enable the wheels of a vehicle to purely roll around the same instantaneous steering center when the wheels steer, and thus the problem of tire grinding can also be effectively avoided.