A coupling hook forms the end piece of a lower link of an agricultural tractor. The coupling hook has a hook body with a receptacle for a coupling body. The hook body has a receiving chamber in which a safety catch is held. The safety catch can be adjusted between a blocking position engaging over the coupling body and a pulled-back release position. By pressing the coupling body into the receptacle of the hook body, the safety catch can be transferred into an activation position from which it is automatically transferred into the blocking position. In order to increase the operational safety of the coupling hook, the safety catch is operatively connected to at least one cam of an adjustable blocking lever. The cam retains the safety catch in the blocking position, preventing a force originating from the coupling body from being able to adjust the safety catch.
