The invention relates to a grounding device with automatic protection, and belongs to the technical field of power transmission safety equipment. The grounding device with automatic protection is connected with three phase lines between a high-voltage breaker and a circuit side switch through grounding wires and a grounding rod, and the grounding device includes a shell having a control panel, a grounding rod sleeve arranged in the shell and used for insertion of the grounding rod and an electromagnetic lock having an operation handle for controlling insertion of the grounding rod; an open endof the grounding rod sleeve communicates with a grounding rod in the shell, and a magnetically controlled switch is arranged at the bottom of the interior of the grounding rod sleeve; and a circuitboard having a protection circuit is also arranged in the shell. According to the grounding device, through cooperation among the electromagnetic lock, the grounding rod sleeve provided with the magnetically controlled switch and the circuit board provided with the protection circuit, misoperation behavior of mistakenly electrified installation of grounding wires and power transmission with the grounding wires can be prevented, and the device is simple in structure, convenient to operate, stable and reliable in work and good in safety performance, and thus has good comprehensive using performance.