A method for controlling valve timing of a turbo engine may include classifying a plurality of control regions depending on an engine load and an engine speed, applying a maximum duration to an intake valve and controlling a valve overlap between an exhaust valve and the intake valve in a first control region, maintaining the maximum duration of the intake valve in a second control region, advancing an intake valve closing (IVC) timing and an exhaust valve closing (EVC) timing in a third control region, controlling the IVC timing to be close to bottom dead center (BDC) in a fourth control region, controlling a throttle valve to be fully opened and retarding an exhaust valve opening (EVO) timing in a fifth control region, and controlling the throttle valve to be fully opened and controlling the IVC timing to prevent knocking in a sixth control region.