The invention relates to a hook, and in particular relates to a safety hook. During the using process of a U-shaped safety hook rigging in the prior art, when a locking part is locked or unlocked, an opening of a hook body can be closed or opened, so that the operation is very inconvenient; additionally, the U-shaped safety hook rigging is complex in structure, and the manufacture cost is increased. A connecting part of the safety hook provided by the invention is arranged on a safety catch; after the hook body is stressed during the concrete using process of the safety hook, the hook body generates a downward acting force, while the safety catch generates an upward and counter-acting force, so that a closed part positioned on the safety catch automatically seals an opening of the hook body; during the operation process, only an object is required to be hanged into the hook body; the safety catch automatically seals the opening of the hook body, and the operation is very convenient.