The utility model discloses a transformer station storage battery voltage T-shaped measuring device. The pen comprises a positive holding rod, a negative holding rod, a display screen, a positive rodserial number key, a negative rod serial number key, a voltage measuring circuit, a rechargeable battery, a negative pen container, a negative copper needle, a hollow screw, a positive pen container and a positive copper needle, the hollow screw, the positive pen container and the positive copper needle form a positive pen, and the negative pen container and the negative copper needle form a negative pen. And a graduated scale is arranged on the front side wall of the anode holding rod. During measurement, one transformer substation operator only needs to hold the positive pole holding rod orthe negative pole holding rod with one hand, the pen with the positive pole and the pen with the negative pole are inserted into the positive pole and the negative pole of the storage battery respectively, and the display screen can display the single voltage of the to-be-measured transformer substation storage battery. The device has the advantages of being capable of measuring the single voltageof the storage battery to be measured of the transformer substation by one-hand operation, greatly improving the working efficiency, being easy to measure, high in accuracy, time-saving and labor-saving, reducing the labor intensity and the like, and is particularly suitable for transformer substations of electric power companies.