The utility model discloses a die casting die with protrusion thin -walled ring shape part, the movable mould and the cover half at its both ends about being located respectively are equipped with therunner at the cover half side, distributes on the movable mould and water, be equipped with the movable mould die cavity and arrange the core in the movable mould die cavity in on the movable mould,be equipped with on the cover half with movable mould die cavity matched with cover half die cavity, the profile and the size of movable mould die cavity are unanimous with the shape of the outer terminal surface of thick type ring bodies, the outside profile of core and unanimous and protrusion in the die joint of movable mould of profile of the interior kenozooecium branch of thin -walled ring shape part, cover half die cavity and core protrusion match in the part of die joint, and form the up end of thick type ring bodies in the thin -walled ring shape part and the outer terminal surface ofslim lug after cover half die cavity and the cooperation of core projecting part, be equipped with on the movable mould and water the flow gate that is linked together with movable mould die cavity and distribution. The utility model discloses the die casting die with protrusion thin -walled ring shape part who obtains can improve the shaping quality of die casting.