A street lamp integration device, a street lamp system and a communication method are disclosed. The street lamp integration device includes a local area network module configured to generate a local area network covering a first range, a traffic collector configured to collect traffic information in a second range and send the same to a communication module and the communication module configured to send the traffic information to a vehicle connected to the local area network. By extensive availability and close mutual distance of street lamps, a local area network is formed within the first range of each street lamp, which helps to to form a network of comprehensive coverage and extensive range. The traffic collector can collect traffic in a certain range and send the same to the vehicle connected to the local area network through the communication module, facilitating awareness of the current traffic by the vehicle.