Locking device for ultrahigh-voltage isolation switch of nuclear power plant

The utility model relates to a locking device of a nuclear power plant ultrahigh-voltage isolation switch, and in the locking device, the isolation switch can be driven to move through a transmission mechanism, so that the isolation switch is in a closed or open state; then, the locking gear is meshed with the driving gear set by rotating the first locking plate, and the first locking plate and the second locking plate are fixed by using a fixing piece, so that the locking gear cannot rotate, the driving gear set meshed with the locking gear cannot rotate, and the isolation switch connected with the driving gear set is locked; even if the isolation knife switch is locked in a closed or open state; therefore, the locking of the isolation switch can be completed without dismounting the box cover, and the operation is very convenient. Moreover, after the isolation switch is locked, the first locking plate can be fixed through the fixing piece, thereby effectively preventing misoperation and reducing operation ri