Safety manhole cover against being stolen

The utility model relates to a safety manhole cover against being stolen, belonging to the auxiliary equipment of a manhole. At present, a manhole cover which is widely used comprises the manhole cover and a manhole ring, and the manhole cover is directly covered on the manhole ring; the manhole cover is not convenient to open, and is also easy to lose; when a vehicle passes over the manhole cover which is easy to roll over to cause an accident. The manhole cover and the manhole ring of the utility model are connected together by a corner chain; the edge of the manhole cover is provided with a notch corresponding to one side of the corner chain. Compared with a traditional manhole cover, the safety manhole cover against being stolen has the advantages of easy opening, safety, theft protection, etc.