Indoor high-voltage electric display device is a new non-contact inductive high voltage electric display device. Mainly used for rated voltage 7.2kv ~ 40.5kv indoor high-voltage electrical equipment, the device uses advanced microprocessor technology and sensor technology, not directly connected with the high-voltage electrified body, senses the electric field signal, accurately reflects the high voltage electrified body charged, and to have reliable high-voltage blocking capabilities of the device. Is safe, no breakdown, anti-interference ability, designed, safe, reliable, inexpensive, convenient installation, indoor high-voltage electrical equipment is used to prevent mistakenly charged interval and electrical misuse of essential equipment.