Abstract: This paper mainly discusses the construction scheme of 4G wireless private network of State Grid Tianjin Binhai company. The 1.8GHz band technology is selected and applied in construction principle, scheme deployment, indoor and outdoor construction and signal software simulation. It is concluded that the construction of 4G wireless private network can meet the business implementation of distribution automation, power information collection and so on. At the same time, it plays a strong support for the construction of new power system.