The invention discloses an adjustable inductor device and an adjusting method thereof. The device comprises n driver plates, m horizontally-moving driving rods, n driving steering mechanisms, n motors and a controller. Coils are wound around the driver plates. Each driver plate is provided with m holes, wherein m/n holes are threaded holes, and the rest of the holes are polished holes. The surface of one end of each horizontally-moving driving rod is engraved with a thread with a certain length. Each hole in each driver plate corresponds to the corresponding horizontally-moving driving rod. The threaded end of each horizontally-moving driving rod sequentially penetrates through corresponding holes in the n driver plates and is only matched with the corresponding driver plates through the threaded holes. The controller controls the motors to rotate and drives the corresponding horizontally-moving driving rods to move horizontally through the driving steering mechanisms, the horizontally-moving driving rods then drive the corresponding driver plates to move leftwards and rightwards through the threads, and therefore gaps between the coils are changed, inductance and distribution capacitance values of the coils are changeable, resonance frequency is fixed, and the device and the method are suitable for high-frequency and high-power occasions.