The utility model discloses a cubical switchboard overhauls prevents touching electrical safety locking device, including first guide rail, second guide rail and tool to lock, the one end of first guide rail is fixed with the first couple of inside lateral buckling, and the other end is fixed with first tool to lock fixed plate, be equipped with a plurality of first tool to lock holes of the samespaced on the first tool to lock fixed plate, the second couple that the one end of second guide rail is equally inwards buckled, the other end are fixed with externally folded second tool to lock fixed plate, be equipped with a plurality of second tool to lock holes of the same spaced on the second tool to lock fixed plate, the tool to lock passes locking behind the first tool to lock hole of aliging mutually and the second tool to lock hole in proper order. Should prevent touching the die isolation barrier of cubical switchboard of lock that the electrical safety locking device can be reliable, and effectively stop to open the emergence that isolation barrier caused the electric shock accidents because of the maintainer is violating the regulations, simultaneously, should prevent touching the electrical safety tool to lock has the elasticity, applicable in the cubical switchboard of different specifications, has better practicality.