Maintenance voltage measuring instrument

The utility model relates to the technical field of voltage measuring instruments, and discloses a maintenance voltage measuring instrument, which comprises a box body and a voltage measuring instrument body positioned in the box body, the top surface and one side surface of the box body are provided with openings, the box body is provided with a sealing assembly, the sealing assembly comprises a first cover plate and a second cover plate, and the first cover plate and the second cover plate are arranged on the box body. The end of the first cover plate is rotationally connected with a second cover plate through a hinge, one end of the box body is rotationally connected with the first cover plate through a hinge, the first cover plate is used for sealing the opening in the side face of the box body, and when the opening in the side face of the box body is sealed by the first cover plate, the positioning rod can rotate along with rotation of the first cover plate. When the first cover plate is closed by a pers