The invention aims at providing a control method and system of LED intelligent street lamps for highway lighting. The control method comprises the following steps: whether LED street lamps on a highway are in an on state or not is judged; if the LED street lamps on the highway are in an on state, the illumination intensity of a first road section is controlled to be set illumination intensity, wherein the set illumination intensity is determined according to the illumination intensity in a tunnel; and the power of LED street lamps on a second road section is adjusted according to the power ofthe LED street lamps on the first road section and the illumination intensity on other non-tunnel roads to enable the illumination intensity of the second road section to linearly change, wherein thefirst road section is a road section connected with the tunnel entrance and located outside the tunnel, and the second road section is a road section connected with the first road section and locatedoutside the tunnel. According to the technical scheme, the illumination intensity in the tunnel does not need to be weakened, so that driving of vehicles in the tunnel is not affected, and the drivingsafety of the vehicles in the tunnel can be guaranteed.