To address the difficulties in monitoring wide-band voltage signals when integrating new energy sources into the grid, where it’s challenging to balance bandwidth, load capacity, and measurement accuracy, this paper proposes a technology for a capacitive voltage divider measurement system based on high-impedance matching. First, the theory behind the capacitive voltage divider measurement system based on high-impedance matching is introduced. Next, a high-impedance attenuator is designed and developed, and step wave response tests and lightning impulse voltage tests are conducted on the capacitive voltage divider measurement system to obtain its load capacity and wide-band response characteristics. The results show that the capacitive voltage divider measurement system technology based on high-impedance matching can achieve stable measurement of wide-band voltage, balancing bandwidth, load capacity, and measurement accuracy, with a time measurement error of less than 1% under high-frequency impulse voltage.