The invention discloses an SBW (steer-by-wire) device with a redundancy function and a control method. The SBW device with the redundancy function comprises a road feel simulation actuator, a steeringactuator and an SBW control module, wherein the steering actuator comprises a first gear-rack mechanism, a first rack travel sensor, a first steering motor controller, a first steering motor, a firststeering motor rotor position sensor, a second gear-rack mechanism, a second rack travel sensor, a second steering motor controller, a second steering motor, a second steering motor rotor position sensor and a steering engine. By means of the redundant first steering motor and first steering motor controller as well as the redundant second steering motor and second steering motor controller, theSBW system can still steer normally once a fault occurs, and safety of passengers in a vehicle is guaranteed.