The invention discloses a steering gear of an unmanned vehicle and a control method thereof, wherein the steering gear is characterized by comprising a motor, a worm gear and a worm, an
electromagnetic clutch and an
encoder, wherein the motor is a steering drive mechanism; the worm gear and the worm are meshed with each other, and the worm is directly coupled with the output shaft of the motor; the
electromagnetic clutch is fixedly coupled with the drive end of the
electromagnetic clutch; and the
encoder is fixedly coupled with a
steering column of a
steering wheel by the driven end of the electromagnetic
clutch and is connected onto the output shaft of the rear end of the motor. The invention can realize the
automatic steering control of the unmanned vehicle, can be freely switched between two
modes of unmanned driving and manual driving the switching of which are not interfered with each other, and has compact structure, low cost, higher transmission efficiency, higher intelligent degree of vehicle
automatic steering; and both the structure and the appearance of the original vehicle are not damaged, and the steering gear is easy to be assembled and dismantled and is applicable to other occasions with high automatic rotation requirements.