Transformer iron core grounding current online monitoring device

The invention discloses a transformer iron core grounding current online monitoring device. The transformer iron core grounding current online monitoring device comprises an iron core grounding element arranged on a transformer body, a transformer iron core grounding current sensor, a data processing module, a single-chip control module, a local area network wireless transmission module, a power supply module and an in-station monitoring device; the transformer iron core grounding current sensor is arranged on the iron core grounding element in a sleeving manner; the transformer iron core grounding current sensor, the data processing module, the single-chip machine control module, the local area network wireless transmission module and the in-station monitoring device are connected one byone; and the power supply module and the single-chip machine control module are connected to supply electric power to the whole device. By monitoring the current of the iron core grounding element, whether multiple points of