Abstract: The invention provides an ignition control device for suppressing reverse rotation of the engine during startup process of light duty gasoline engine and a method of suppressing reverse rotation of the engine during startup process of light duty gasoline engine, the ignition control device comprises: a charge coil, a transformer, an electric-spark-generating control circuit, a trigger coil, a position sensing circuit, and a micro-controller. The position sensing circuit is used to shape the positive signal and negative signal of the second alternating current signal induced by the trigger coil while the fly wheel rotates respectively to generate a first position signal and a second position signal and provide the first position signal and the second position signal to the micro-controller.