The utility model discloses a power system wide -area prevention of mistake blocking device, the device comprises a device body, the front side of device body is equipped with switch, switch's below is equipped with the display screen, the inside of display screen is equipped with the pilot lamp, the below of display screen is equipped with communication adjustment button, one side of communication adjustment button is equipped with lock button, the rear side of device body is connected with the backup pad, be equipped with the locating hole in the backup pad, the below of backup pad is equipped with the interface, the interface is including the communication interface and the interface that charges, this internal main control board that is equipped with of device. The utility model relates to a rationally, the reliability height, long service life prevents missing the seamless?connection of system with the computer, easy to assemble and maintenance, the while is portable also, and to the wearing and tearing and the corruption of installing the body, the demonstration is clearly striking, and automatic self -checking need not the manual work participation, when detecting the plant failure, reliably locks automatically, has reduced artificial control, has improved work efficiency.