The utility model relates to a high -tension apparatus measurement of partial discharge air core coil sensor, it includes annular skeleton, evenly be provided with the coil on the annular skeleton, the coil is that the impedance is the 50 ohmic coaxial cable structure coil that wraps around, coil one end is connected with measurement impedance, the coil other end is connected with the balanced impedance. The coil all is provided with shielding fracture, all at each circle the exposed conductor of shielding fracture department passes through the common wire and connects, the common wire is connected with measurement impedance and balanced impedance. The utility model discloses the air core coil sensor is used for high voltage alternating current power equipment partial discharge wave forms such as transformer, GIS, power cable to detect, the saturation of no magnetic core, wide bandwidth, high sensitivity, strong, the good reliability of interference immunity measured.