The utility model discloses a voltage acquisition device of a high-voltage capacitor discharge prompting device. The voltage acquisition device is arranged on the secondary side of a discharge coil ofa high-voltage capacitor. The voltage acquisition device comprises a micro-processing chip, a voltage division circuit, a wireless communication module and a display module, the input stage of the voltage division circuit serves as the input stage of the voltage acquisition device, and the input stage of the micro-processing chip is electrically connected with the output stage of the voltage division circuit; the first output stage of the micro-processing chip is electrically connected with the input stage of the display module; and the input stage of the wireless communication module is electrically connected with the second output stage of the micro-processing chip. The beneficial effects of the utility model are that: 1, the structure is simple, visual equipment is provided, the residual voltage value of the capacitor can be visually observed, and the safety of capacitor bank maintenance personnel during operation is improved; and 2, the discharge condition can be checked through the wireless communication module, the discharge waiting time is reduced, and the working efficiency is improved.