The utility model discloses a low-voltage line loss analyzing system in a public transformer power supply area. The system comprises a main processing module, a station meter information addressing device and a distributed data acquisition module; basic data at an electricity-utilization client side is collected, the network structure of a station meter in the public transformer power supply area is updated automatically, an actual line loss analysis report is formed rapidly according to a theoretical line loss mode in the power supply area, and improvement opinions and suggestions are provided intelligently, so as to generate a specific solution. The low-voltage line loss analyzing system provided by the utility model has the benefits as follows: the theoretical line loss in the power supply area can be computed automatically and rapidly, meanwhile, the network structure of the station meter in the public transformer power supply area is updated automatically, an improvement plan is put forward according to influences of various factors on the theoretical line loss, the defects that the low-voltage power supply area is lack of data and the theoretical line loss is difficult to compute are overcome, and the low-voltage line loss analyzing system deserves wide popularization and application.