Power distribution line online monitoring system

The utility model discloses a power distribution line online monitoring system comprising a master station system (1) which is used for acquiring loads and voltage of a line (2), monitoring and judging faults of the line (2) and state of a remote monitoring switch and protecting trip-out in real time, and multiple line monitoring points which are connected with the master station system (1). Each line monitoring point comprises a front end acquisition device (21) and a data transmission device (22). The front end acquisition device (21) is provided with a switch which is controlled by the master station system (1) and used for closing or separating the corresponding line monitoring point. With enforcement of the online monitoring system, A fault segment is confirmed and eliminated under that condition that an operation and management staff masters the operation state and the line faults of the line online, and the front end acquisition device is provided with the switch so that all secondary connecting wires