Online monitoring system for underground transformer station pollution

The invention discloses an online monitoring system for underground transformer station pollution. The online monitoring system comprises a monitoring center and a mobile monitoring unit. The monitoring center and the mobile monitoring unit are mutually connected. The mobile monitoring unit comprises a first track network arranged inside the transformer station, a second track network arranged inside the ground surface pipe above the transformer station, and a mobile monitoring module arranged on the first track network and the second track network. The mobile monitoring module comprises a walking mechanism, a monitoring device and a first communication device. The monitoring device and the first communication device are arranged on the walking mechanism. The first track network and the second track network are provided with a positioning device each. According to the invention, with very little electromagnetic radiation, the monitoring instrument can monitor the electromagnetic radiation inside an undergroun