The embodiment of the invention discloses an inductor of a keyless entry system antenna, a design method and a device, and relates to the field of emitters. The inductor comprises a ferrite core and an enameled wire wound on the outer surface of the ferrite core, and the ferrite core is formed by connecting at least two ferrite pellets whose length is less than a set length threshold value coaxially in series. The embodiment of the invention provides an inductor for a keyless entry system antenna, a design method and a device thereof, which realize long-distance communication between an emitter and a remote controller without increasing power consumption. And the problem that the magnetic core of the inductor is broken due to external shock or vibration is solved.