The invention discloses an inductor for current formation in a high-voltage impulse circuit, which comprises a metal coil, an epoxy insulating layer, an unclosed induction coil, a detachable closure device, a multi-stage lead-out sheet, a coil support and a base; the metal coil comprises a metal coil, an epoxy insulating layer, an unclosed induction coil, a detachable closure device, a multi-stagelead-out sheet and a base. An epoxy insulating layer is coated with a metal coil to form an inductor housing, A metal coil first end is connected with a lead-out tab, a second end is connected with aplurality of stage lead-out tab, a cylindrical shell made of epoxy insulation layer is arranged at that center of the base, a plurality of non-closed induction coils are fixedly connected with a coilsupport on the base, and a detachable closure device is selectively installed on the non-closed induction coils according to a test current condition, and the metal coil first end is connected with alead-out tab, the epoxy insulation layer is arranged at the center of the base. The inductor of the invention has a plurality of inductance value selections, realizes the fine adjustment of the current waveform in the high-voltage impulse circuit, obtains the selection of the optimum inductance value of the specific working loop, realizes the inductance value change by changing the connecting length of the metal coil and the magnitude of the magnetic field established by the coil, is safe and reliable in use, and is suitable for the working condition of large current.