To strengthen the standardization of substation inspection and safety supervision, this paper designs the substation safe operating system based on internet of things technology. This paper mainly presents the on-site acquisition system scheme. It introduces the equipment selection, installation notes, localization algorithm and detailed implementation programs. In the work area the system locates the position of staff and tracks the patrol route. It is more efficient to detect and manage the behavior as straying into the restricted area and dropping inspection, etc.