The invention discloses an inductive discharge high-gradient impact current generator, which comprises a charging circuit, a main capacitor bank, a discharge switch, a cut-off switch, a main inductor, a first wave modulating resistor, a discharge gap, a second wave modulating inductor and a second wave modulating resistor, wherein after the charging circuit is connected in parallel with the main capacitor bank, one end of the charging circuit is grounded and the other end of the charging circuit is connected with one end of the discharge gap through the discharge switch and the cut-off switch in sequence; the other end of the discharge gap is connected with the second wave modulating resistor through the wave modulating inductor; after the main inductor is connected in parallel with the first wave modulating resistor, one end of the main inductor is connected with the node of a loop equivalent resistor and the discharge gap, and the other end of the main inductor is grounded. Impact current is produced by using an RL loop, the requirements on the voltages at the two ends of a charging capacitor are low, and the amplitude of the produced high-gradient impact current is high, thereby enhancing the practicability and economic efficiency of engineering application.