An ignition control device and corresponding method are provided for suppressing reverse rotation of the engine during startup process of a light duty gasoline engine, the ignition control device includes: 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. According to the first position signal and the second position signal, it is determined by the micro-controller whether the engine is in the state of reverse rotation, and if YES, output of the ignition signal is stopped to make engine halt due to absence of reverse power.