Tensioner model should be noted that these do not affect the effectiveness of the implementation of the utility model and the utility of the patent. The scope of protection of the claims of this disclosure shall be based on the claims, the content of the claims used to illustrate the specification "specific implementation", etc. Steel rope tensioner a secondary die opening mechanism with tension hook, including a dynamic mode and a fixed die, said fixed die and dynamic mode combined to form a cavity inside, the fixed die has a common injection hole with the cavity above, characterized by including a motion mode and a second motion mode, set in the cavity with the second motion mode connected to the mandrel. In the first motion mode, there is a hook with a twist spring mounted on the hinge axis of the hook, and in the second motion mode, there is a table shoulder corresponding to the end of the hook. A limit block is provided under the hook on the fixed mode, which is glued to the back of the hook.