Self-locking sealing bottle cap assembly

The utility model relates to the technical field of packaging bottle caps, in particular to a self-locking sealing bottle cap assembly which comprises an upper turning cover and a lower cap body, the upper turning cover and the lower cap body are connected through an integrally-connected hinge, the lower cap body comprises a top cap, an inner cap and an outer cap, the inner cap and the outer cap are coaxially arranged and connected to the lower side of the top cap, and the inner cap and the outer cap are connected to the upper side of the top cap. An internal thread is arranged on the inner circumference of the inner cover, a liquid outlet hole is formed in the center of the top cover, and a plug pipe matched with the liquid outlet hole is arranged in the center of the upper turning cover; the lower edge of the outer cover is connected with a lock ring through a plurality of connecting ribs arranged at intervals, and anti-reversion lock teeth are arranged on the inner circumference of the lock ring. According