The utility model discloses a low-voltage equipment online operation endoscope monitoring device which comprises a hollow conduit and a guide mechanism sealed and fixed at the opening of the shell of the equipment, wherein the conduit is inserted into the equipment from the opening of the shell of the equipment; the conduit and the guide mechanism are sealed and are in sliding fit; the conduit slides along the guide mechanism to enable the front end of the conduit to move in the equipment; and a photographing mechanism is arranged at the front end of the conduit. The low-voltage equipment online operation endoscope monitoring device is simple in structure, convenient and flexible and can monitor the low-voltage equipment online.