Common mode inductor

The utility model belongs to the field of common-mode inductors, and provides a common-mode inductor which comprises a magnetic core, a first winding wire and a second winding wire, the first winding wire and the second winding wire are wound on the magnetic core in parallel, each of the first winding wire and the second winding wire is provided with two leading-out ends, and the leading-out ends are correspondingly arranged on the upper surfaces of the two ends of the magnetic core respectively. The upper surface of the magnetic core is provided with a cover plate, the bottom of the cover plate is provided with a plurality of receding grooves which are the same as the leading-out ends in number and correspond to the leading-out ends in position, and the receding grooves cover the leading-out ends respectively. One end of each conductive piece is connected with the leading-out end, and the other end of each conductive piece is connected with the bottom of the magnetic core. The cover plate can cover the leadi