On-line monitoring system and method for high-altitude frozen soil layer power transmission line iron tower foundation

The invention provides an on-line monitoring system and method for high-altitude frozen soil layer power transmission line iron tower foundation. The on-line monitoring system comprises a ground foundation monitoring device, a tower monitoring device, a state monitoring agent device and a power transmission line iron tower ground foundation on-line monitoring and warning master station, wherein the ground foundation monitoring device collects ground foundation monitoring parameters of a power transmission line; the tower monitoring device collects tower monitoring parameters of an iron tower; the state monitoring agent device obtains the ground foundation monitoring parameters and the tower monitoring parameters in a wireless fidelity (WIFI) mode and transmits the obtained parameters to the power transmission line iron tower ground foundation on-line monitoring and warning master station in an optical fiber composite overhead ground wire (OPGW) mode; and the power transmission line iron tower ground foundatio