The utility model relates to an isolator moving contact safety connecting device, its technical scheme is: respectively through fixed two first insulation of finger plate and second insulator on the support frame, the second insulator fix on the bearing frame, connect through the connecting rod between two finger plates, first insulation and the fixed seat of being qualified for the next round of competitions in top of second insulator, contact in the middle of the inside of the seat of being qualified for the next round of competitions is equipped with is qualified for the next round of competitions between the seat through the current conducting plate connection for two, the bottom of support frame connect locking joint, the beneficial effects of the utility model are that: simple structure, design construction convenience has improved the cable running life, has ensured the service reliability requirement through setting up locking joint, effectively reduces switch contact's the rate of droing, ensures power supply's stability, has effectively solved ground lead and has drop and the too big problem of circulation.