Inductor and preparation method thereof, filter and electronic equipment

The invention provides an inductor and a preparation method thereof, a filter and electronic equipment, and belongs to the technical field of electronic elements. The inductor comprises a first dielectric substrate (10), the first dielectric substrate (10) comprises a first surface and a second surface which are oppositely arranged in the thickness direction of the first dielectric substrate (10), and the first dielectric substrate (10) is provided with a first connecting via hole (11) penetrating through the first dielectric substrate (10) in the thickness direction of the first dielectric substrate (10) and a first groove part (12) penetrating through at least part of the first dielectric substrate (10); the first substructure (21) is arranged on the first surface; the second substructure (22) is arranged on the second surface; the first connecting electrode (25) is arranged in the first connecting via hole (11), and the first substructure (21) and the second substructure (22) are sequentially connected to form a coil structure of the inductor; the magnetic core (3) is arranged in the first groove part (12), and the magnetic core (3) is insulated from the first substructure (21) and the second substructure (22) and located in the coil structure.