The utility model discloses a low pressure distribution lines on -line monitoring system, including low pressure power failure monitor terminal, communication adapter and the public terminal that becomes of intelligence. Low pressure power failure monitor terminal carries out the data interaction through wireless mode of micropower and the communication adapter of installing in the platform is distinguished, and communication adapter rethread wireless communication carries out low pressure power failure data upload to the intelligent public terminal that becomes, and intelligence public affairs change terminal will the system to distal end monitoring main website of transmitting after low pressure power failure data sort and handle.