The utility model provides a 3G wireless network video monitoring device power supply, belongs to the electric power system auxiliary assembly field. The utility model aims at providing a wireless video unit of 3G on the power cable circuit directly provides the 3G wireless network video monitoring device power supply of power. The utility model discloses a rectification filter circuit, DC DC converting circuit, voltage protection and energy bleeder circuit, transient state protection, tank. The utility model discloses fully considered the various condition of field usage, can reliable and stablely supply power under the condition of low temperature and heavy current change. High -power this difficult point of power supply has in the twinkling of an eye been solved, for the reliability that increases mains operated. Shelf life can reach more than 10 years under the room temperature.