The utility model discloses a safe push -and -pull device of switch dolly, including frame, gear, pivot and connection cardboard, the pivot level sets up, and rotates and fix on the frame, and outside the one end of pivot extends to the frame, and this end is fixed with the crank, the fixed cover of gear is established in the pivot, and the gear below is provided with the rack rather than matched with, connects the cardboard and slides along vertical orientation and fix at the rack terminally, connects the cardboard both ends and still is provided with the handle fixed plate, and the distance after the distance between two handle fixed plate inner walls and two the unblock handles unblock of switch dolly equals, frame the back -end is provided with the rear wheel, and rear wheel department is provided with rear wheel brake mechanism, still include two be used for with the cabinet of cubical switchboard in the track track that goes on docking, switch dolly to test position's in -process is pulled out or pushed to this push -and -pull device fortune dimension personnel, utilizes this push -and -pull device to replace manual operation, has improved operating efficiency greatly, and safe in utilization.