The utility model discloses an auxiliary measuring tool special for a transformer station storage battery. The auxiliary measuring tool comprises a measuring rack. The measuring rack comprises a rack head, a left supporting leg and a right supporting leg. The rack head is composed of an upper hand-held handle and a lower U-shaped clamping head. The upper ends of the left supporting leg and the right supporting leg are hinged to the interior of U-shaped clamping head mutually through hinged bolts. Each of the lower ends of the left supporting leg and the right supporting leg is equipped with a sleeve body which a meter pen can be inserted into. The side end of the sleeve body is equipped with an adjusting bolt for fastening the meter pen. The hand-held handle and the U-shaped clamping head are fixed and welded together. The top of the adjusting bolt is equipped with an adjusting nut. During the measurement process, one-man operation can be achieved, a universal meter is place at one side, a hand holds the meter pen, the other hand holds a record pen, measurement and record can be carried out at the same time, measurement time of a storage battery can be shortened obviously, measurement working efficiency is raised, and the auxiliary measuring tool has good application values and market promotion prospects.