The invention discloses an intelligent lamp post integration device for 5G application and an implementation method. The device comprises a central control module, a light intensity detection module,a 5G communication module, an air detection module, a camera monitoring module, a liquid crystal display module, an emergency alarm module, a temperature and humidity detection module, a noise detection module and a positioning module. The street lamp light control method based on fog computing is realized through 5G communication and a networking technology based on LoRa. According to the streetlamp light control method, some data processing does not need to be accessed to the Internet, so that the data processing time is shortened, and the cloud load is reduced. According to the light control method of the system, the light control model based on the regional position data does not depend on single lamp data for control, single lamps are associated but nearby data clusters, auxiliary calibration management is carried out through data of nearby street lamps, smooth operation of the whole network is guaranteed, and the whole system cannot be affected even if a single sensor breaks down. The problem of obtaining adjacent position points is solved.