The invention discloses a "vehicle-bridge"-based internet collaboration-based intelligent traffic control method and a system thereof. The system comprises a wireless local area network, a distributedtype camera, a road and bridge cloud platform and a vehicle cab display part, wherein the wireless local area network covers a target bridge and a road connected to the bridge, and is used for information interconnection of vehicles, roads, bridges and monitoring equipment in a regional range; the distributed type camera is equipment used for acquiring parameters of a motorcade on the road and transmitting an acquisition result to the road and bridge cloud platform; the road and bridge cloud platform records information of the road and the bridge at the target position, pre-calculates and acquires of the bridge where the motorcade passes, and provides a vehicle following distance control index; and the control index is transmitted to the vehicle cab display part and is compared with an actual vehicle following space so as to sound an alarm to remind the operation of a driver. According to the system disclosed by the invention, the bridge safety is fused into an intelligent traffic system, and the vehicle following distance control index of a truck can be provided in real time to prompt the driver to take actions, so that the safety of small and middle-span bridges under overload and heavy-load transportation environments can be effectively guaranteed.