The invention discloses a switch cabinet back door and ground switch interlocking mechanism, which comprises a bent plate I and a shaft sleeve fixed to the front wall of a mounting beam in a switch cabinet respectively, a bracket plate fixed to the back wall of the mounting beam, a top plate and a hook plate fixed to the inner wall of a switch cabinet back door, and a bent plate II fixed to the inner wall of the front cabinet body of the switch cabinet; and the mechanism also comprises a brake cable pipe, a brake cable, a shaft, a stop pin and a top rod. When the switch cabinet back door is closed, a ground switch operating handle can be inserted in a ground switch operating hole and is sleeved to a ground switch operating end head; and when the switch cabinet back door is opened, the ground switch operating handle cannot be inserted in the ground switch operating hole. The interlocking mechanism meets ''five-prevention'' function of the switch cabinet, can effectively ensure safety of overhauling personnel, improves reliability and practicality, and has the characteristics of strong completeness, convenient installation, high adaptability and the like.