The invention discloses a connector socket used a for eddy current testing device. The connector socket comprises a first medium body, an inner conductor, a first outer conductor, a clamping ring, a second medium body and a second outer conductor. The inner conductor is inserted inside the first medium body, the first medium body is inserted inside the first outer conductor, and the clamping ring is disposed in the first outer conductor. The second medium body is sleeved on an outer ring of the first outer conductor, and is in thread engagement with the same. The second outer conductor is sleeved on outer ring of the second medium body, and is thread engagement with the same. The first outer conductor and the second outer conductor are connected through wires. The connector socket can really reflect that a counter magnetic field generated by eddy current changes resistant of a tested coil, and interference information is effectively prevented and reduced. The connector socket is advantaged by simple structure, convenient usage, and accurate detection.