The utility model aims to provide a reliability, while providing a simple structure of the secondary mold opening mechanism with hook. The secondary mold opening mechanism of steel rope tensioner with hook includes dynamic mode and fixed mode, said fixed mode and dynamic mode cooperate to form a cavity inside, and on the fixed mode there are injection holes shared with the mold, said dynamic mode includes one action mode and second action mode, and in said module there is a core rod connected with the second action mode. In said one action mode the steel rope tensioner is installed with a hook, and a torsion spring is installed on the hinge axis of the hook, and in the second action mode a table shoulder corresponding to the clamping end of this hook is provided.