Adjustable inductor

The utility model relates to the technical field of inductors, in particular to an adjustable inductor. Comprising a shell, an opening is formed in one side of the shell, a top cover is arranged at the opening, a rotating core is rotationally connected into the shell, a first center shaft is arranged at one end of the rotating core and penetrates out of the top cover, a spiral piece is arranged outside the rotating core, and a spiral coil with the same screw pitch as the spiral piece is located in a spiral groove formed by the spiral piece. The depth of the spiral groove is larger than the wire diameter of the spiral coil, one end of the rotating core is provided with a conductive ring connected with one end of the spiral coil, the conductive ring is in sliding connection with a first pin arranged on the shell, and a guide rail is further arranged in the shell and is in sliding connection with a conductive sliding block. One end of the sliding block is provided with a contact head which extends into the spira