The utility model discloses a fault recognition device and an application device of a high-voltage capacitance device. The fault recognition device and the application device of the high-voltage capacitance device comprise a receive-transmit unit, a process unit and a judgment unit, wherein the receive-transmit unit is used for receiving and transmitting circuit signals of a capacitor input form outside at a moment and inputting to the process unit. The process unit processes the circuit signals and inputs process results in the judgment unit. The judgment unit judges work conditions of the capacitor according to the process results. The fault recognition device and the application device of the high-voltage capacitance device can continuously monitor the work conditions of a single high-voltage capacitance device, diagnose early defects, send out warning signals, and give relative countermeasures. Therefore, work safety of the whole high-voltage capacitance device can be ensured and safe economic benefits of a power system are effectively improved.