The invention provides an installation device for an outdoor internet-of-things communication device, and relates to the field of internet-of-things communication. The installation device for the outdoor internet-of-things communication device comprises a shell body and an installation column. Installation grooves are formed in two sides of the inner wall of a sliding groove at equal intervals. Alifting type installation mechanism is fixedly arranged at the middle part of the back side of the shell body. A slant hose is fixedly bonded to the inner side of a line entrance hole. A fastening mechanism is arranged on the outer side of the slant hose. A sealed heat dissipating mechanism is arranged in an inner cavity of the shell body. A blocking cover is arranged at the top of the sealed heatdissipating mechanism. An annular groove plate is fixedly connected with the outer side of the blocking cover. An annular deflector is fixedly connected with outer side of the annular groove plate. The intervals caused by wiring are eliminated in the process of fastening wiring by using the fastening mechanism and the sealed heat dissipating mechanism. And the air tightness of the installation device is ensured. At the same time, the sealed heat dissipating mechanism can diffuse the heat in the installation device under a sealed condition, and the heat dissipating effect of the installation device is ensured.