The invention discloses a detection method, device and system based on a grounding grid. The method comprises: data of a grounding grid are collected, wherein the data include at least one of a geographic location of a grounding wire in the grounding grid, a buried depth of the grounding wire, and an operating state of the grounding wire; and the data are sent to a network communication unit, wherein the network communication unit is configured to output the data to a target terminal by means of a radio signal carrying the data. Therefore, a technical problem that the specific location of thegrounding wire can not be located accurately based on the existing positioning way in the prior art is solved.