Anti-forge bottle cap

The utility model discloses a false-proof bottle cap, comprising an opening (20), an inner cap (21) and a twist-off ring (23). The opening (20) and the inner cap (21) are detachably connected through screw interface; the lower outer wall of opening (20) is arranged with at least three baffle teeth (201) distantly along its circumference; the inner ring of twist-off ring (23) is arranged with at least three baffle teeth (231); the opening (20) and the twist-off ring (23) form the ratchet device through engaged baffle teeth (201, 203); the twist-off ring (23) and the inner cap (21) are connected integrated through detachable connecting structure. The invention has the advantages that: when rotating the bottle cap anti-clockwise, the baffle teeth of twist-off ring and the baffle teeth of opening will not slip with each other, and the twist-off ring can be broken completely, thereby improving the false-proof function, with simple structure and better practicality.