Online monitoring system for electrified railway traction station grounding grid

The invention discloses an online monitoring system for a grounding grid of an electrified railway traction station. An existing grounding grid is tedious in detection, and the real-time operation state of the grounding grid cannot be monitored. An input end of a system control unit is connected with output ends of an acquisition filtering unit and an external communication unit; an output end of the control unit is connected with input ends of a constant current power unit and a communication unit; the input end of the parameter monitoring unit is connected with the output end of the constant-current power unit. The output end of the parameter monitoring unit is connected with the input end of the acquisition filtering unit. The control unit sends a detection instruction, and the constant-current power unit outputs current required by the monitoring unit; the monitoring unit monitors operation state parameters of the grounding grid; the acquisition filtering unit transmits an obtained measurement signal to t