The invention relates to a remote automatic monitoring device, especially to a safe operating and fault remote-
positioning system for a 
ring network cabinet. The technical scheme comprises three parts: a monitoring center, transmission networks and on-site equipment. The monitoring center is provided with a data 
server, a browsing terminal, an operation terminal, a network short message 
server and a preposition work 
station, which are used for receiving the data of each monitoring point, realizing the functions of data storage, analysis, determination and alarming, etc, and reminding relevant work staff of the on-site operation condition in different ways. The 
system of the invention can timely detect the cases of the 
ring network cabinet such as the rising of a cable temperature, the alarming of a 
fault indicator, etc, and when the temperature rises to a certain 
limit value, the 
system can immediately give an alarm and prompt users to take measures to prevent accidents, thereby greatly raising the operation security of 
distribution networks. Besides, when a line has a fault, the 
system can automatically report fault information, and through the analysis of 
software, automatically determine a fault position, rapidly search for the fault and timely recover power supply, thereby raising the reliability of power supply.