The utility model provides a line loss positioning device of a low voltage overhead line. The line loss positioning device comprises a plurality of transformers which are electrically connected mutually, a meter, a wireless data transmission terminal and a carrier collection device. The line loss positioning device is characterized in that each of the transformers is formed by the hinge connection of a body and an end cover through a hinge, the meter comprises a host machine formed by an MCU processing control module, an operation shell, a liquid crystal display surface device and wiring terminals, the host machine is installed in the operation shell, the liquid crystal display surface device is fixed at the upper end face of the operation shell, two rows of wiring terminals are symmetrically arranged at the upper end lower sides of the upper end face of the operation shell, the wiring terminals at the upper and lower sides are respectively connected to the corresponding interfaces of the host machine in the operation shell, the transformers are connected to one row of wiring terminals corresponding to the meter through conductive wires, the other row of wiring terminals of the meter are connected to the wireless data transmission terminal, the data transmission is carried out through an RS-485 communication protocol, and the wireless data transmission terminal and the carrier collection device transmit data through radio waves.