The utility model relates to a protection device, and provides a safety protection device for an XGN type electric power switch cabinet in order to solve potential safety hazards existing in the process of using the XGN type switch cabinet. The device comprises a protection lock arranged on a cabinet door at the reverse side of the switch cabinet, wherein the protection lock comprises a cylindrical lock body, and the surface of the cylindrical lock body is provided with an annular concave groove. The device further comprises a lock body sealing cover, wherein the lock body sealing cover is formed by hinging and folding two semicircular cylindrical cover pieces, the cover piece comprises a semicircular arc-shaped shell, one end part of the shell is provided with a semicircular end plate, and the other end part of the shell is provided with a semicircular ring end plate; and each of the other sides of the shells of the two cover pieces is provided with a lock hanging plate, and the lock hanging plate is provided with a hanging hole. When the two cover pieces are closed, the two lock hanging plates are folded, and the hanging holes are communicated correspondingly. The protection device provided by the utility model is novel in structure, simple in manufacturing, and capable of being widely applied to the XGN type electric power switch cabinet.