Mouth die body including two reciprocal half die body, described the mould body right and left half die bodies die bodies, respectively, described the mould body cavity in turn from top and bottom of the set has a mouth ring seat cavity, bottle molding parts, as described in the mouth of the ring hold cavity and the mouth rings are convex platform structure, described in the bottom of the mouth ring edge set a mouth ring transition curved surface, referred to the mouth of the ring to accommodate cavity and the part of the mouth ring arc transition faces with set up half a mode transition curved surface. Arc transition fit below Make the bottle mould when use not easily get bruised, greatly increased the bottle mould service life, in the production process of glass bottles, glass bottles does not need frequent replacement, reduces the production cost.