The utility model relates to a waveform regulating device of an enclosed impact impulse voltage generator. An inflating hole is formed in a sealed insulated enclosure of the waveform regulating device; the top end of an upper umbrella skirt insulator is fixedly connected to the top end of the sealed insulated enclosure, and the bottom end of a lower umbrella skirt insulator is fixedly connected to the bottom end of the sealed insulated enclosure; an inter-resistance insulated support frame is fixedly connected between the upper umbrella skirt insulator and the lower umbrella skirt insulator; a segmented non-inductive wave front resistor is fixed on the upper part of the inter-resistance insulated support frame, and a half-peak resistor is fixed on the lower part of the inter-resistance insulated support frame; one end of the segmented non-inductive wave front resistor and one end of the half-peak resistor are led out after being connected; three outgoing line ends are sequentially arranged on the segmented non-inductive wave front resistor; the three outgoing line ends are respectively connected to corresponding gears inside a gear switch by virtue of lead wires; an outgoing line gear of the gear switch is led out after being connected by a lead wire; and the other end of the half-peak resistor is connected to a grounding point of the sealed insulated enclosure. The waveform regulating device disclosed by the utility model can solve the problem that an existing impact impulse testing apparatus fails to regulate a waveform.