The utility model discloses a distributing line online monitoring acquisition terminal capable of obtaining power from a distributing line. The terminal is used for being matched with a line failure indicator to monitor the operation of the distributing line. The terminal is additionally provided with a high-voltage line power obtaining part used for obtaining working voltage from the distributing line, wherein the high-voltage line power obtaining part comprises a current sensing power supply used for transmitting energy on the distributing line to the secondary side of the line for isolation power supply, a charging circuit used for storing the energy and converting the energy into the working voltage, and a switch circuit connected between the current sensing power supply and the charging circuit and used for controlling the current sensing power supply to directly charge the charging circuit. Due to the adoption of the current sensing power supply, cost is reduced, ferromagnetic resonance is avoided, and the safety of a power grid is improved greatly.