Voltage monitoring device with fault self-diagnosis function

The utility model relates to a voltage monitoring device with a fault self-diagnosis function, which comprises a voltage monitor and an AC/DC conversion module, the voltage monitor comprises a first processing module and a first communication module, the voltage monitor also comprises a fault monitoring device, and the fault monitoring device comprises a second processing module, a second communication module, a first monitoring module and a second monitoring module. The second processing module transmits the first monitoring signal output by the first monitoring module and the second monitoring signal output by the second monitoring module to the second communication module, and the second communication module sends out the first monitoring signal and the second monitoring signal throughthe antenna. When the AC/DC conversion module cannot provide normal working voltage, the AC/DC conversion module has problems in a large probability, and when the AC/DC conversion module provides normal working voltage and th