Abstract: An anti-theft steering wheel locking device which appearance and function are all the same with the one that in the market but has an anti-turning cylindric member hidding either underneath, on top of or in the steering wheel which is able to be pulled out and locked at fixed position when parking to prevent unauthorized driving the vehicle. When driving the car, driver only needs to unlock the locking device with a legal key then pushes the cylindric member back into a tube which is located in a trough and the steering wheel at this moment is able to turn freely without any disturbance. This device, furthermore, takes no extra space.