Provided is a transformer station monomer storage battery voltage measuring device. The voltage measuring device comprises a first insulation feeler lever, a second insulation feeler lever, a digital display voltmeter and two probes arranged at the front end of the first insulation feeler lever and the front end of the second insulation feeler lever respectively. A through hole is formed in the rear end of the first insulation feeler lever. A first screw hole is formed in the rear end of the second insulation feeler lever. A butterfly bolt goes through the through hole and is screwed in the first screw hole. The rear end of the first insulation feeler lever and the second insulation feeler lever is equipped with a handle. The digital display voltmeter is embedded in the handle. The extension directions of the two probes are parallel to the axial direction of the butterfly bolt. The two probes are connected with the digital display voltmeter through wires arranged inside the first insulation feeler lever and the second insulation feeler lever. The measuring device is simple in structure and is easy to manufacture, only one person is needed to complete measurement work, operation is convenient, the consuming time is short, and the working efficiency can be raised effectively. The distance between the two probes can be adjusted manually according to distances between positive electrodes and negative electrodes of different monomer storage batteries.