The invention relates to a grounding switch and rear door interlocking device and a switch cabinet employing the same. The switch cabinet comprises a cabinet body, wherein a rear door is arranged at arear side of the cabinet body, a grounding switch is arranged at a middle part of the cabinet body along a forward-backward direction, the switch cabinet also comprises an interlocking device, the interlocking device is used for achieving interlocking of the grounding switch and a rear door and comprises an operation front shaft, the operation front shaft is matched with the grounding switch in atransmission way, the interlocking device also comprises an operation rear shaft, the operation rear shaft is in linkage with the operation front shaft and is used for locking and unlocking the reardoor, axial lines of the operation front shaft and the operation rear shaft are staggered, an eccentric shift piece is arranged on the operation front shaft, an eccentric bearing piece is arranged onthe operation rear shaft and is used for swinging under shift of the eccentric shift piece so that the operation rear shaft is driven to rotate and linkage of the operation front shaft and the operation rear shaft is achieved, the interlocking device also comprises an elastic piece, and the elastic piece is used for applying an action force applied onto the eccentric bearing piece so that the eccentric bearing piece moves towards the eccentric shift piece. Compared with the prior art, the interlocking device is simpler in structure, and meanwhile, the cost is also favorably reduced.