The utility model relates to a switchgear field, in particular to cabinet door interlocking device and use this cabinet door interlocking device's cubical switchboard. The utility model discloses a cabinet door interlocking device includes the spring bolt, still includes ground connection interlocking piece and the interlocking piece of mechanism, and ground connection interlocking piece is locked to separating with the motion of spring bolt block cooperation restriction spring bolt when earthing switch is in non - contact of earth state, and the cabinet door of cubical switchboard can not be opened, and the interlocking piece of mechanism is locked to separating with the motion of spring bolt block cooperation restriction spring bolt when on -off mechanism is in the separating brake state, and the cabinet door of cubical switchboard can not be opened equally. Compare with present cabinet door interlocking device, the utility model discloses a cabinet door interlocking device is when using, and when only the earthing switch in the cubical switchboard was in contact of earth state and on -off mechanism and is in the operating position, the cabinet door just can be opened, has solved the cabinet door interlocking device of cubical switchboard owing to can not guarantee on -off mechanism and has been in the low problem of fail safe nature in the cubical switchboard maintenance process that the cabinet door that just can open the cubical switchboard behind the operating position led to the fact.