Fresh-preservation bottle cap

The utility model provides a fresh-preservation bottle cap, comprising an external cap, an inner cap and a bottleneck. A hollow cylindrical storage chamber and an anti-seeping conical ring positioned on the lower part of the hollow cylindrical storage chamber are arranged in the external cap, and the external part of the hollow cylindrical storage chamber is provided with screw threads; the lower half of the inner cap is provided with a circular ring and a spherical body, and the circular ring is matched with the anti-seeping conical ring by sealing; the upper part is of the inner cap is a hollow cylinder provided with internal screw threads, and the internal screw threads are matched with the screw threads on the external part of the hollow cylindrical storage chamber; the upper part of the excircle of the inner cap is provided with a first ratchet, and the bottleneck is provided with a second ratchet which is cooperated with the first ratchet on the inner cap. The utility model has the advantages of easy opening and low cost, the fresh-preservation bottle cap can be used for storing various natural beverages, and the beverages can be kept without deterioration for a long time.