A steering wheel steering angle display device for an automobile, belonging to the automobile instrument device, is used for displaying the steering angle when the automobile steering wheel is steering. The purpose of the invention is to provide a device capable of displaying the steering angle of the steering wheel of the automobile, thus to help the driver accurately to control the automobile to steer and improve running safety. An angle sensor is installed on the automobile steering mechanism, the specific installation position can be any position on the joystick, steering post, steering engine, pull rod, steering knuckle arm, steering knuckle and steering wheel, if only the angle sensor at the position is capable of directly or indirectly sensing the steering information of the automobile steering wheel. The angle sensor transforms variations of the steering angle of the steering wheel into variations of the electric quantity signal and output the signals to a signal processing circuit, the signal processing circuit processes the signals inputted by the angle sensor and output the signals to the display circuit to display.