Abstract: In nuclear data measurement and other research endeavors, there is an increasing tendency towards shorter pulse width beam¹. Bunching the beam in the low energy beam transport line can enhance the parameters, quality and operability of the beam. In this paper, a low-frequency and high-compression ratio buncher working in low-energy beam transport line is designed and developed to achieve longitudinal compression of pulsed beams. Due to the low resonant frequency and the operational constraints of electronic components, the resonant cavity structure and the AC power supply is not suitable for the generation of bunching voltage. In this paper, the LC resonant circuit is employed. The 3 MHz RF power is fed into the buncher through the inductor coil, and the bunching field is established in the gap between the two drift tube to achieve a 12 kV bunching voltage. Consequently, a 100 ns pulse beam could be bunched into a 10 ns pulse beam.