Power distribution network automation system and switching signal detection method thereof

The invention discloses a power distribution network automation system and a switching signal detection method thereof. The system comprises an automatic switch communication terminal, a switch signal detection device and a distribution network master station, the automatic switch communication terminal is configured with at least two different communication channels; the switch signal detection device comprises at least two communication cards; the automatic switch communication terminal is in communication connection with the distribution network master station through the switch signal detection device; the automatic switch communication terminal is used for outputting switch signals to the switch signal detection device through at least two different communication channels; and the switching signal detection device is also used for collecting the signal strength of the current communication channel, and switching the communication channel to transmit the switching signal to the distribution network master