The invention discloses a steep front pulse peaking and front reshaping device. Supporting insulators (2) are respectively connected to a first end A and a second end B of a peaking switch (3); two adjacent supporting insulators are matched with each other to form two closed spaces (7 and 8) which are independent of each other with a shell; the rear end of the first end A of the peaking switch (3) is connected with an intermediate energy storage oil line (1), and the intermediate energy storage oil line (1) is connected with a harmonic resistor (4); a precise air pressure meter (5) is arranged in the closed space (7) and positioned on the shell; and a peaking switch clearance adjustment unit (6) is arranged at the rear end of the second end B of the peaking switch (3). A steep front pulse peaking and front reshaping technology is implemented on the basis of the steep front pulse peaking and front reshaping device, and by matching the harmonic resistor, the intermediate energy storage oil line and the peaking switch, the output steep wave of an impulse voltage generator can be peaked and reshaped.