The invention provides a voltage live-line measurement device capable of preventing fault arcs. The device comprises a closed insulating shell, a voltage measurement device, a first shielding sleeve and a second shielding sleeve, wherein the voltage measurement device is arranged in the shell; the first shielding sleeve and the second shielding sleeve sheath the shell; the voltage measurement device is provided with a first test line and a second test line which respectively extend to the outside of the shell; the external peripheral face of the second test line, the external peripheral face of the voltage measurement device and the external peripheral face of the first test line which is located in the shell are wrapped with a third shielding sleeve; the first shielding sleeve and the second shielding sleeve are respectively, correspondingly and conductively connected with the first test line and the third shielding sleeve; the first shielding sleeve and the second shielding sleeve are spaced to form a barrier clearance; a metal discharging lantern ring striding over the barrier clearance sheaths the firsts shielding sleeve; the front section of the metal discharging lantern ring and the external peripheral face of the second shielding sleeve are spaced in parallel to form a discharging clearance; the discharging clearance can implement discharging when the transient overvoltage occurs; the fault arc is led to the outside of the shell to prevent the arc from damaging a voltage measurement device in the shell.