The invention relates to an auxiliary system for safe and reliable transport of a switch dolly. The system comprises a mechanical arm, a platform vehicle, a conveyor belt and a cabinet door motor. The conveyor belt is installed a certain distance away from a switch cabinet at one side of the switch cabinet in a parallel mode, the platform vehicle is installed on the conveyor belt between the conveyor belt and a cabinet door in a sliding mode, a deceleration commutator is coaxially installed at one end of the door shaft of the cabinet door of the switch cabinet in a sleeving mode, a connecting rod is coaxially installed at the other end, which is vertical to the door shaft, of the deceleration commutator in a sleeving mode, the other end of the connecting rod is connected with the cabinet door motor, and the mechanical arm, the conveyor belt, the cabinet door motor and a proximity switch are controlled through a PLC program. The system provided by the invention makes use of a sensor technology and a PLC technology, utilizes a PLC motor to replace manual work for operation, and realizes automatic operation of the switch cabinet door, the conveyer belt and the mechanical arm.