The utility model relates to an auxiliary leakage current measurement apparatus of a zinc oxide arrester. The auxiliary leakage current measurement apparatus is characterized in that the apparatus consist of a first insulated support rod, a second insulated support rod, and a ground lead. A first fixed pulley is arranged at the top of the first insulated support rod; and a second fixed pulley is arranged at the top of the second insulated support rod. A first wire clamp device is fixed at the first insulated support rod; and a second wire clamp device is fixed at the second insulated support rod. One side of the lead ground is locked at the first insulated support rod by the first wire clamp device; and the other side of the ground lead is fixed at the second wire clamp device by winding around the first fixed pulley and the second fixed pulley. Therefore, the influence on leakage current measurement by the current at the porcelain sleeve surface of the lightning arrester can be reduced; and the measurement accuracy can be improved. Moreover, the operation is simple and is easy to do; and the time and labor are saved.