The utility model discloses a to taking follow -up to turn to secondary navigation system of headlight vehicle. Car navigation system and mobile navigation software on the market, these navigation need the driver to bow or incline the head to see and navigation's screen cause the traffic accident very easily when using. The utility model discloses a battery, GPS signal processor, voltage conversion module, turn to light control module and the follow -up turns to big light control module, it includes first relay, second relay, left indicator, right indicator and steering switch wherein to turn to light control module, the follow -up turns to big light control module and includes third relay, fourth relay and motor. The utility model discloses to taking the follow -up to turn to the headlight vehicle, utilize current lighting system aided navigation, the driver need not divert attention can know navigation information, has strengthened the security of driving.