Battery voltage measuring device

The invention discloses a battery voltage measuring device which can improve measuring efficiency and comprises a shell, a probe module, a transmission mechanism, a sliding rail and a voltage measuring circuit module. The sliding rail is fixedly connected with the shell; the probe module is slidably connected with the slide rail on one side, far away from the shell, of the slide rail, and the probe module is connected with the voltage measuring circuit module; and the transmission mechanism is arranged in the shell and is in transmission connection with the probe module. When the battery voltage is measured, the battery voltage device is aligned with the battery, the probe module can slide in the direction perpendicular to the pole piece of the battery under the action of the sliding rail,then the probe module moves in the direction close to the pole piece of the battery under the action of the transmission mechanism, the probe module makes contact with the pole piece of the battery,and when the probe module