Present invention provided a Pedal Driving Device for two wheels Scooter. It comprises a front driving-leg and a rear driving-leg rotatively connected to both upper ends. A driving-shoe provided at lower end of rear driving-leg. It imitates human' action, kicking back to produce momentum. A supporting-sliding wheel provided at front of the driving-shoe. For a two wheel scooter, it can be equipped with one or two set of the present invention.