The invention discloses an intelligent power nuclear phase device, which comprises a central processing unit (CPU) board, a digital quantity sampling board, an analog quantity sampling board and a liquid crystal display board, wherein the boards are connected through a rear panel bus. The device is characterized by also comprising electric vector acquisition interfaces of intelligent secondary equipment in an intelligent transformer station and conventional secondary equipment in a conventional transformer station; by comparing electric vectors of different interfaces, the purpose of electricphase check is achieved; and the electric vector acquisition interfaces comprise an analog quantity input interface module, a 9-1 interface module, a 9-2 interface module and an FT3 interface module.The device can be used for comprehensive phase check of digital electric quantity and conventional analog electric quantity in the intelligent transformer station, and improves the field engineering debugging and daily operation and maintenance efficiency of the intelligent transformer station.